It's true. Madoka isn't assuming that the resting has anything to do with getting hurt, or with some wound. Especially when it's so incredibly easy to just assume that it's because Ken is tired.

Even though she herself hasn't been out there, Madoka knows that there's a lot of fighting to be done. That there had been a lot to do the entire mission, and since Ken can fight, he probably went out and did just that - and it might have left him too tired to fight now, other than to protect the camp.

"Well.. that's okay, you know..?"

Despite her worry, she still tries to offer her friend a small smile.

"This mission has really been tiring. It's a good thing to rest when you're tired, rather than push yourself.."