At the very least, we should know if they're in pain. As long as we're watching, if they need to be separated we can do that.

[ Sure enough, Cocoa does NOT see it coming! He yelps (though it doesn't sound pained so much as surprised) as she lands on top of him, and he can be seen squirming first this way and then that before finally rolling over to try to roll on top of her and then wrestle to grab at her paw. ]