Charlie informed Ron that he would ask some of his friends to pick up Bruce Lee from the tallest tower in Hogwarts late at night. After that, Ron specially ran to the library to inform Marca and asked him if he would like to go with them in the evening.

But it wasn't long before Marca saw Ron with a blue face in Hagrid's house.

He fell askew on Hagrid's sofa, his hand almost swollen into a ball, and the wound was still slightly green.

"Dragon tooth toxin," said Maka, looking at his hand, "you were bitten by it?"

"Oh - I don't think Norbert did it on purpose, it's just a little scared..." Hagrid looked sorry.

"I think it must hurt," said Harry, with a lingering fear on his face.

"It's not just my hand," said Ron in a low voice, "although it hurts like it's going to break. What's worse, Malfoy laughed at me just after class. He pretended to ask me to borrow a book and took the opportunity to touch my wound --"

Harry and Hermione tried to calm Ron down.

"By midnight on Saturday, it's all over," Hermione said, but it didn't comfort Ron at all. On the contrary, he stood up from the sofa and broke out in a cold sweat.

"Saturday midnight!" he said hoarsely, "Oh, no! Oh, no - I just remembered that Charlie's letter was in the book Malfoy borrowed. He must know we're going to take Norbert!"

"It's too late to change the plan," Harry said to Hermione. "We don't have time to send another owl to Charlie, and it's probably our only chance to get rid of Norbert. We have to take a risk."

"We have invisibility vests! Malfoy doesn't know that."

"It's all right. I'll go too. Compared with this, Ron, you'd better go to the school hospital," Marca smiled. "Before your hands start to rot."

"Or I'll make you some ointment for Dragon tooth toxin."

A week passed quickly.

But that night, when Marca stood in the corridor and saw Harry and them coming out of the invisibility cloak. He saw Harry looking at him with an embarrassed look.

"Sorry, Marca," he said. "I mean, I'm afraid I can't fit you in the invisibility cloak."

"Oh, no," said Marca with a smile. "You can be invisible without an invisibility cloak. Let's go! But I can't talk when I'm invisible. Don't worry about me. I'm right next to you."

Then he took out the Xianyin medicine and took a sip. Suddenly Harry found that he couldn't even figure out how Maka disappeared, as if there was no one there.

This is the most outstanding advantage of Xianyin potion - it can make people disappear in the sight of others in the most inconspicuous way.

"Well - let's go!" Harry scratched his head, covered his invisibility cloak again and hid everyone's bodies.

It was a dark, cloudy night. It was a little late when they arrived at Hagrid's cabin. Because Pippi was playing tennis against the wall in the hall, they had to wait until he left.

Until they laboriously moved the large crate containing Bruce Lee Norbert to the top of the tower, they suddenly heard something in front of them.

The little lions were so frightened that they almost threw away the box in their hands. In a panic, they seemed to forget that they were invisible and crowded into the shadow of the stairs.

Marca had to step aside because he was almost hit.

He saw two dark figures wrestling with each other about ten paces away from them. A lamp twinkled in the dark.

One of them seems to be Professor McGonagall.

She was wearing Plaid pajamas and a hairnet and was holding Malfoy's ear angrily.

"Confinement!" she shouted. "Slytherin deducted 20 points! How dare you --"

Malfoy quickly refuted, "you don't understand, Professor, Harry Potter is coming - he has a dragon!"

"Total nonsense! How dare you make up such a lie! Go - I'll see what Professor Snape will do to you this time, Malfoy!"

Professor McGonagall left here with Malfoy's ears. When passing by Marca, he also looked at Malfoy's slightly red face with great interest.

After getting rid of Malfoy, the steep revolving staircase leading to the tower was unimpeded for them. Harry and his party came to the cold night sky before they took off their invisibility cloak.

As they waited, they giggled at Malfoy, and Norbert moved violently in the box.

"Where's Maka? Are you still following?"

Harry suddenly thought of Marca. He looked back, but there was no movement. Hermione could not help worrying.

About ten minutes later, four brooms suddenly landed from the darkness.

Charlie's friends are cheerful people. They showed Harry and Hermione the ropes they had temporarily tied so that they could hang Norbert between them.

The four men tied Norbert safely to the rope, and then Harry and Hermione shook hands with them and said a lot of thanks to them.

Finally, I watched the four men leave far away with their boxes and disappear into the night sky.

They slipped down the revolving stairs and finally got rid of Norbert's heavy burden. Even their steps became much easier.

Is there anything more pleasant than that when the dragon is gone and Malfoy will be locked up?

There are no more happy things than this, but there are obviously many worse things than this.

As soon as they stepped into the corridor, Filch's face suddenly appeared from the darkness.

"No, no, no," Harry whispered. "We're in trouble."

They were overjoyed and left their invisibility cloak on the top of the tower. Just when they were very anxious, a thin thing suddenly covered their heads.

"Marca?" whispered Hermione in a startled voice.

Maka smiled bitterly at them because it was too late. Just as the invisibility cloak was covered, filch had seen him.

"Hermione, your observation is good." he and filch looked at each other eye to eye, but they were not busy and whispered a joke.

This is the biggest disadvantage of Xianyin medicine. As long as you take the initiative to let people see it, the stealth effect will be completely gone. Just now, Marka had hidden in the shadow behind them, but Hermione saw it for the first time.

"Oh, yes, Mr. McLean!" filch said rudely, looking at him fiercely. "I think I should hand you over to Professor McGonagall - Professor spraot is too gentle with his students."

Under the invisibility cloak, Harry and their worried gaze, Marca followed Filch's footsteps. He even had time to quietly wave his hand to them to make the three little lions not too impulsive.

When filch led Maka to Professor McGonagall's study on the second floor, they found that Professor McGonagall was not here. After waiting for a long time, Maka found that Professor McGonagall was followed by a short, fat and timid little boy - Neville Longbottom of Gryffindor.

"Marca!" Neville blurted out trembling when he saw him. "Why are you here? Malfoy said he was coming to catch -"

"Neville," Maka immediately interrupted him, "I think Malfoy must have intended to frame me, but it doesn't matter. And thank you for your concern."

After that, he turned to Professor McGonagall and said, "Professor, I'm really sorry. But please listen to me."

Professor McGonagall was obviously angry because she saw Maka in this situation again.

"Before you explain, do you have to tell me, Mr. Potter and Miss Granger, where are they now?"

Maka wants to know with her ass that Neville must have been reckless and confused about the situation.

He did not look at Neville, but looked at Professor McGonagall with calm eyes and said calmly: "well, Mr. Malfoy had a quarrel with Harry before, so he heard me when I discussed with Harry about the knowledge of dragons. I think Mr. Malfoy mistakenly thought we really had a dragon, but how is this possible?"

"As for tonight, I'm sorry to say, it's really my fault," said Marca, putting a bottle of magic medicine on Professor McGonagall's desk. "I inadvertently mentioned to Harry that they had developed a new magic medicine. I wanted to test it tonight, but they seemed very interested in it."

"New potion?" Professor McGonagall's anger suddenly disappeared, but showed a shocked expression. "You mean, this is the potion you invented?"

"Yes, Professor," Marca continued apologetically. "Harry, they wanted to come out to me, but I persuaded them back early. Maybe they went wrong with Neville."

Maka sighed when she saw Neville, who was in a state of ignorance - although Neville was not brave at ordinary times, he was so brave and reckless at the critical moment that he was worthy of being a Gryffindor student.

Professor McGonagall obviously didn't listen carefully. She still looks incredible at the moment!

"Mr. McLean, I want to know what effect this potion you invented has?" Professor McGonagall carefully picked up the potion bottle on the table and asked seriously.

When Marca explained the use, advantages and disadvantages of Xianyin medicine to her in detail, Professor McGonagall immediately decided to tell Dumbledore and Snape the good news overnight. Although Maka had expected for a long time, she still felt for Professor McGonagall's spirit of caring for students and schools.

"So you invented it?" snape corked the bottle again after smelling the Xianyin medicine, with a rare look of surprise on his face.