It's not a flicker from the overhead lights this time; it's one from the window, as Sylar turns his head to catch it. He can't see his reflection.

Easing his arm away from his stomach, he returns his attention to Kaylee. "I wouldn't think that would stop you," he murmurs. "Does he want to take all the glory, then?"

Just like before.

(No. That was Peter. (That was your delusion.) Wasn't it?)