"I'd be surprised if at least a few didn't get down there. After the way that wake-up call cut off -"

Well, he's worried about the Professor, even if he's not saying it in so many words. He knows he can't be the only one.

Swords aren't always the greatest weapon to bring into a fight when one lives by a no-kill philosophy, but Leo's good at controlling how much force he puts into things - and he's also good at noticing when his enemies are zeroing in on the sword at the expense of possibly realizing that he's about to slam a foot into their gut, instead.

Swords still have their uses.