He meant to keep up the facade, he really did, but he couldn't help the calm grin that crossed his features as he fed on the boy's rage. It was the down turned grin of the Nogitsune, a look so completely not Stiles that his closest friends would know what he was with just a glance. He didn't really care if this stranger picked up on the differences.
"You're a very hostile person," he pointed out, sounding amused by it. "I wonder how strong you could be if you channeled that rage into real violence." He looked Alec over, studying him. "But you've seen real violence, haven't you?" he realized.