"Ow," he says, because it did indeed hurt. He's going to have bruises on his hip and shoulder at least, and possibly more.

Then he immediately contradicts himself and says "I'm fine." This is because it doesn't hurt that badly, and also because Olympia is panicking and he doesn't want her to work herself up into a tizzy.

Slowly, he sits up properly, careful not to groan in the process.