What If Harry Potter Let Sirius Kill Peter Pettigrew?

What If Harry Let Sirius Kill Peter Pettigrew? Peter: Harry. Harry! Stop them…Harry, please… Harry: You killed my mum and dad…not with your own wand. But you killed them. Sirius raises his wand…Lupin raises his. Peter: No. No, no, no, please, PLEASE… Two wands rise together. Two jets of light. The room fills with green for half a second, and then it is over. Peter Pettigrew's body lies on the floor. The room is still. Snape is slumped against the far wall, unconscious. Harry's Expelliarmus caugh