And that leaves Sylar clamped utterly still, as if turned into a statue mid-lunge, only his eyes tracking and his breath coming in frenzied little puffs.

Yes, he's frightened. What the hell is happening? (He should have known better than to approach someone he knew, after Darla and Suresh.) Has she been able to do this all this time? (Keeping it a secret-- Chandra would have shared it, had he known.) How the hell did she know exactly what to ask? (He has alternates here. Maybe people know.) And what is she going to do to him now?