Suddenly he wishes he hadn't used so much of the serum. Maybe it would have been better if Hyde had taken over, at least he could get through this with confidence. "I-" am absolutely terrified, of the very concept, of disappointing - "don't really know?" what he's doing, that is. It's just different when it's Hyde, he's different when he's Hyde.

He's also just plain scared because he's a weenie and too uptight. But he doesn't really have the words for that.