With anyone else, he would have lied. He intended, when he opened his mouth, to tell her he had rounds and that he had to leave. But when he spoke he heard himself saying, "I don't, I just need to get out of this room." And he was... well, a little horrified, quite frankly, that he'd been so honest with it.
"Do you want to go for a walk with me?" He hadn't intended to ask, but he couldn't let her think he was trying to escape her. "We've another hour still until curfew."