The Peter flying away complaint is getting old. It's been shown that he can lose control over his power already, he had just absorb several new abilities, and Ted's power is even hard for Ted to suppress at times. He was focusing his concentration, just because he didn't have 'Hiro's concentration face' doesn't mean he wasn't doing it.
And has anyone considered that Sylar was realizing events were unfolding as he'd seen them, and part of what he saw was him being stabbed but surviving, so he let it happen because he knew it wouldn't stop him in the long run?
And has anyone considered that Sylar was realizing events were unfolding as he'd seen them, and part of what he saw was him being stabbed but surviving, so he let it happen because he knew it wouldn't stop him in the long run?