Hux's first instinct was to tell Ren that he didn't have to listen to him. He wasn't a stormtrooper that he could just boss around. They were nearly equals under Snoke and he didn't take orders from the volatile knight. Miraculously, Hux managed to not say any of this and went for a more logic retort.

"As I said during our encounter, that Luke Skywalker wasn't of the correct age that he should've been. Even considering that he's the actual Skywalker, we cannot kill someone in broad daylight when we have no information about our current situation and how we got here. The First Order is not here and further complications will only impede our progress in figuring a solution to return back to our galaxy."

Hux managed to say all this with his blank cool, the air around him becoming steady as the crack he caused earlier started to repair itself.