"I don't think he knows how to be careful!" the Cutemon on Chalice's back calls out to Bakumon. "Unless it's with the party food! Then he was real careful!"

Chalice kicks a Numemon up in the air at punching level, then punches it away. See? Resilient.

That, and he's becoming aware he's not hitting as hard as he might under ordinary circumstances, but like hell he's about to mention that to someone he's only just met.