[bobbyi]

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Adam definitely didn't know he could heal before he met Hiro. (He clearly never cut himself shaving or whatever.) He wasn't a bad guy. He didn't know Hiro was a good guy.

[/ QUOTE ]
Yeah. It looked like he turned bad as a result of being heartbroken and betrayed (as he perceived it) by Hiro. Before that, he was just unmotivated and drunk.