"He can't," Sylar tells him adamantly. "He tried that once before, and I stopped him, because it's wrong on so many levels. How long before someone worse than me gets their hands on it?" He's comfortable with being the thing in the dark, a monster, despite Arthur trying to reassure everyone present otherwise. "And that's assuming it even works at all. The last time he tried it, it didn't turn out right. It would have killed anyone who tried it."
Or at least ruined their DNA to a point beyond repair.
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"He can't," Sylar tells him adamantly. "He tried that once before, and I stopped him, because it's wrong on so many levels. How long before someone worse than me gets their hands on it?" He's comfortable with being the thing in the dark, a monster, despite Arthur trying to reassure everyone present otherwise. "And that's assuming it even works at all. The last time he tried it, it didn't turn out right. It would have killed anyone who tried it."
Or at least ruined their DNA to a point beyond repair.