Jean seems a little confused by the word 'guns'--he's from a time period where the crossbow is the most deadly innovation in weaponry, but he doesn't ask yet. Jack might well be talking about some sort of magic.

He nods, though, at the idea of sneaking him out. "Stealing someone's laundry and presenting me in a fancy tunic, perhaps. I'm sure I can maintain the dignity of one called a guest."