"I'll be sure to pass that sentiment on to the Captain." Assuming he lives long enough.

"You are asking me to trust you quite a lot already." He's not sure he wants to know how bad the alternative was. Maybe not until after they are out of this.

His eyes flash dangerously with challenge, "Do I look like a coward to you?" There. She's said the magic words to get him to agree to this. No one accuses him of cowardice.

"None of this is perfectly safe. So, let's get on with it." No comment on if he actually would or would not push her off the ship. (He wouldn't, no matter how tempting.) No, he simply jumps and catches the ledge, using his surprisingly robust strength to pull himself as far up into the shaft as he can given the limited space.

"Do whatever it is you're going to do then."