When Steve glances uncomfortably back (he's doing it a lot; one would even imagine that he does not entirely trust Sylar!), he does a midair double-take. This is an entertaining manouvere which involves a momentary swerve to the side as the head is unthinkingly turned too far into the slipstream in the name of confirming that yes, that's the face he's wearing.

...Um. He's just going to get back on course and wonder whether to be immensely disturbed.