"I'm used to making people unhapp--eeee!" He'd been speaking to them, looking to them instead of where he was going, and so he doesn't duck out of the way at all, whoops. The cold painful shock is like a slap in the face, making his last word (happy) turn into a weird yelp. How dignified.

The area nearby darkens, his shadow deepens, all signs he's about to flee...