Kotetsu did mention a little bit, but not the healing part. "...thought it just made you guys a lot stronger." They're giving him a fishy look. If he's lying to make them feel less worried, that's dumb and they're tired of that kind of thing.

They noticed that. Not entirely sure of what to make of it. Nervous?

As well as I can be. That could mean a lot of things, Barnaby-bunny.

"You know how to fly a kite?" they ask in lieu of speaking their thoughts.