Code words? He hadn't used code words since he'd been in the creche, attempting to liberate cookies. Giving his head a shake, clearing away the memories and reminding himself that sometimes a classic was a classic for a reason, he made an affirmative noise.

"Affirmative," was what he said in response to let her know he understood her directions and would use said code words if necessary. "In the meanwhile, I believe we're starting to make inroads. I trust you will try to keep us aware of any trouble before we come upon it?"

An unspoken inquiry into whether or not she intended to stay on the roof, providing directions, or if she had plans to make her way inside the building.