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Also, with Ted's ability to go boom, you'd think he'd put up more of a fight against Sylar.

Ted was very concerned eariler with not harming others again, saying things like "put me in a lead-lined cell" to Clea Duvall, so he's probably quite reticent to use his powers. Also, he didn't know who Sylar was, which means he doesn't know what he looks like. It's easily possible that he didn't realize that it was Sylar until his head was half open.
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Bitt Faulk