I think some of Syler's powers are there to be understood by the audience, not shown. As Tyche says, he knew he was going to kill him, he either could have deduced it with his power of understanding, or he could have just heard him. He was looking directly at them, it's likely he could have used both, and noticed that he clearly wasn't going to do it by listening in, hence why he didn't do something to protect himself.
The point is, they don't show you all these tricks because, most likely, they add to the shooting time of each episode. And sometimes the cost (what, you think CGI is free? Pfft.).
edit: rofl at "nerf"ing Peter. You guys are too precious.
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