[BetteDavisEyes]

Here's something I read from another message board that definitely makes a lot of sense. See if you agree or disagree with this theory.

Ive been thinking about this. Peter is an empath, as someone has mentioned. We know that he is able to take on the powers of others when around them. And we have had a hint of him taking on their ailments( with Matt). There is also the ideas that he can sense all energy around him, being that this explosion is coming soon, he would pick up on the energy from it. That particular energy is negative. Thus he became sick. There is also the thought that empaths are known to put themselves in anothers shoes. As we have seen he does not take on their personalities. The vision he had was him as Sylar I think. Sylar was close by, maybe not in the same building, but in the same city. Sylar's power keeps growing, thus his energy grows with it as well. Peter is able to pick up on this energy from a distance, maybe not the powers, but sense the presence of Sylar. Being that he was not able to at first could be because of three things. Sylar's energy was checked by the Haitian, and then the Haitian left. Or he was able to gather Eden's power. Last he was able to use his power against Eden, thus the energy was sent like a shockwave and Peter picked up on it. I think it had to do with both the haitian leaving, and Sylar attacking Eden that Peter got sick and had a vision. Personally I never would have imagined an empath being that powerful, but it looks like Peter might be the only one who can find Sylar, and neutralize him, or at least even the odds.