Harry's POV
As Harry held his KW case in one hand and turned the time turner's hourglass with the other, he kept reminding himself why he does it.
Lupin was innocent, that was something he knew from his classes, as while he doesn't talk about it much, whenever the man talks about the way a man should behave, talks about right and wrong, about morals, the man has a passion in his eyes you can't fake.
A man like that can't know about cold blooded killing and be fine with it.
Remus Lupin was innocent, and the only reason he's about to disappear from this world is his loyalty and chooses of friends.
As he stopped turning the time turner he appeared in his room at the time he walked out of the Shrieking Shack, about the time when Professor Snape caught him.
Putting the invisibility cloak on him, Harry silenced his legs and walked out of his room, making sure no one notice him.
Getting out of the castle and into the forbidden forest was extremely easy, making Harry wander why none of the headmasters since the start of school has never put any ward to stop anyone from coming in.
The howl he heard before he came back in time told him he needed to move northwest, and five minutes to his run he saw them.
Lupin was at the back, holding Pettigrew as a prisoner with a manacles on him, and two of the Gryffindor students close to him- Granger and Neville as they talked to Lupin about something, looking like they were trying to ignore the fight the other people were in.
Up front the other two Gryffindor students were, Ronald Weasley being floated as he seemed to be crying about his leg and Marcus who was listening to the fight the two Marauders were having.
"But why? I understand you being angry with him going to Slytherin and kicking him out of the house, not saying it was the right thing to do, but I understand. But leaving him as a baby? How could you do it?"
"I didn't have a choice, ok? Both Lily and the headmaster told me it's the right thing to do, that letting him grow in the shadow of his famous twin would cause hate to grow in him, that we need to focus on Marcus as he need to be ready for when Voldemort returns!"
"So you threw away your unwanted son like garbage?"
"No, we left him with Lily's sister, and he was never unwanted, I wanted him!"
"So why does you listen to them? Where was the man who pranked anyone who he felt deserved it? Where was the man who heard about Snivellus walking to his death and Rasheed to save him?"
"HE DIED!" James screamed at the fugitive "He died when he found out his best friend, his brother in all but blood, betrayed him."
"It wasn't me." Sirius whispered.
"I know that now," James said as he rubbed his head in pain "but my memories still say it's you, and even now I need to remind myself it wasn't. Think about my side of the story, waking up in my ruined house, running upstairs, crying to Merlin that my family is alive as I know in my heart they are dead. Finding out they are alive, the relive I felt, only for the sinking realization it means you were tortured, and probably dead yourself.
Three days of looking for you non stop in the Death Eaters' houses, interrogating them thhe best I can only to find out you killed Wormtail. Realizing you betrayed us, I was a mess, drank for weeks, by the time I came out of it, my first born was gone, Marcus barely knew who I am, the story the world was told about what happened that night was changed for the death of Lily's parents, my wife changed, and you were found guilty.
My life were destroyed the day Voldemort came but the one who destroyed them wasn't him, it was you."
"ME? You blame me?"
"No, I blamed you, now I blame Wormtail."
Hearing James story was extremely interesting to Harry, and if the reason for Harry's revenge was their abandonment of him, he would have forgiven him, but his hate was about the death of his parents, and he didn't care if James or Lily killed them, they would all pay!
Steeling his emotions, Harry opened his case, taking out his already built rifle from the expended space, as could see the moment he was waiting for arrived.
A cloud shifted. There were suddenly dim shadows on the ground. Their party was bathed in moonlight.
Harry could see Lupin's body getting rigid. Then his limbs began to shake.
"Oh, shit" Harry heard James say. "He didn't take his potion tonight! He's not safe!"
"Run," Sirius yelled. "Run. Now."
There was a terrible snarling noise. Lupin's head was lengthening. So was his body. His shoulders were hunching. Hair was sprouting visibly on his face and hands, which were curling into clawed paws.
While the students were running away, Marcus taking control over the floating spell Ronald was in, Sirius and James disappeared from their side. transforming, in place of them there was an enormous, bearlike dog bounded forward together with a delicate, yet strong stag. As the werewolf wrenched itself free of the manacle binding it, to Pettigrew, the dog seized it about the neck and pulled it backward. And the stag was with him, ramming his horns at the beast's body.
While everybody were busy, Pettigrew managed to peak up Lupin's dropped wand and free himself before transforming into a rat and disappearing.
While the werewolf was strong,, it couldn't deal with the two animagus together, it was hurt, and running away.
Aiming at the werewolf, Harry waited till it was gone from regular sight before shooting five times, hitting him twice on the back and once on the leg.
The thing about werewolves in their beast form is that they have immunity for most magics, so unless he used the killing curse or a similar spell, taking down a werewolf with magic is pure stupidity, therefore making it a terrifying beast in the eyes of the magical people. On the other hand, as could be seen by the fight between the three shapeshifting wizards, physical attacks works just fine, making it like a Lion with rabies for anyone without magic, scary, but not a nightmare.
The rifle wasn't a regular one, but a Tranquillizer, each of its bullets filled with muggle sedatives, so the resistance to magic won't stop it from working.
As he took the werewolf out, the group of six were running in the other direction, moving toward the castle.
Opening his case again, he levitated a huge cage, before levitating the ground on which the werewolf was lying on and put it, with the werewolf in the cage.
Feeling the cold that showed the Dementors are close, Harry quickly summoned his patronus, before walking to the Shrieking Shack, the cage moving with him, as he was going to wait for the morning to do the last boot of his plan, when Remus Lupin would be no more.
James' POV
It was all wrong, both his heart and mind was fighting each other, one blaming Sirius and the other blaming Peter, respectively.
And, as he so Padfoot lying there, crying for help as the Dementors came closer, James tried to summon a happy memory, yet couldn't, all his thoughts were full of guilt and sadness, he felt he was about to die, about to let Sirius die, Marcus die.
'No' summoning his determination for his son to live he managed to throw away all his negetive thoughts as he focused on his happiest memory, one that he hasn't used in years, not since they left Harry- the day his children were born.
"EXPECTO PATRONUM" he roared, the stag patronus leaving his wandas it attacked the Dementors, taking more and more magic as he repelled the soul sticking demons.
As the last one left, James saw a blurry figure with a long beard.
"Headmaster" was his final words before everything went black.