"Shoot the others, and avoid being hit." It sounds like a regular gunfight to him, honestly, but with... lesser stakes. That could be fun and not deadly. He wouldn't make fun of her liking it, why would he? It seems like a simple training exercise.

"How is your aim?" Not better than his, certainly, but if she would like to continue playing, he can think of a way to make it interesting for the both of them.