[Anyway. He shakes his head, discarding that train of thought for now. Self-care is only so important and will have to wait until later. More importantly...]
Do you mind?
[He picks up a nearby rock, about the size of his own fist. Weights it in his hand for a moment.]
With your bare hands, please.
[And then he throws the rock at Porthos, with no more warning or explanation. It's with a very human speed and strength, and he tactfully aims it at Porthos' shoulder, so... no harm intended?
I mean, literally how else are you supposed to check how agile and strong someone is?]