If Peter were running into the front hall from the kitchen, Snape would have a perfect shot of his back.
Instead, the situation is more delicate than that. He slips fast out of the seat in the living room, thumbing back the safety on his gun, and putting his back to the wall next to the door from the front hall. If the intruder does burst into the house and carry on down the hall Peter will be able to put a bullet in his back.
If, on the other hand, he's coming from the kitchen... well, that will depend where Snape goes first, and how quietly he does it. Peter waits where he is, gun at the ready. There's no screaming, no panic, just cold steadiness as he stays absolutely still and listens keenly.
He remembers Mundt, learned something from the experience. The key is to get the man away from his wand, and failing that, kill him before he can say a word.
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Instead, the situation is more delicate than that. He slips fast out of the seat in the living room, thumbing back the safety on his gun, and putting his back to the wall next to the door from the front hall. If the intruder does burst into the house and carry on down the hall Peter will be able to put a bullet in his back.
If, on the other hand, he's coming from the kitchen... well, that will depend where Snape goes first, and how quietly he does it. Peter waits where he is, gun at the ready. There's no screaming, no panic, just cold steadiness as he stays absolutely still and listens keenly.
He remembers Mundt, learned something from the experience. The key is to get the man away from his wand, and failing that, kill him before he can say a word.