Hitting a deer's rump with a car makes such a loud noise. A thump that's more than a thump, but just short of an explosion.
You wonder what's broken. You're amazed that the animal gets up and walks away.
Then you stop. Later on. Where you can stop safely.
You'd swerved. You almost missed the animal. A few inches more and it would have been a clean getaway for both of you.
The headlight on the side that nicked the deer is smashed to smithereens. How did the deer do that and walk away?
You think of the deer's eyes ... Dan Quayle eyes ... eyes caught in a headlight. You'd honked. You swerved, you braked. You almost killed yourself.
Damned car! Should've walked.