He does know how to be professional and controlled when he wants to. He couldn't have survived in the First Order, much less in charge of it, if that wasn't true. Being used to a military setting, himself, her staunch practicality sets him at ease.

"We should be prepared for a fight, then." He won't complain if that's what it comes down to. As far as he's concerned, having something to swing a sword at can only be satisfying after sitting here stewing with his own thoughts.