Despite the fact that he knew that it was coming, Peter jumped when the mirror shattered, scrambling back a few steps to avoid the rain of glass. Considering how very little he knew about magic and the fact that the shards were oddly non-reflective, almost black, when they hit the ground, he was pretty sure he'd made the right decision. And he stood there in silence for a moment, staring at them before he dared to shift back closer to the group.