His hand lazily pushed her hand away as they laughed, revelling in that feeling of giving into humor. Not everything was hopeless - no. In moments like this, Luther couldn't help but be reminded that if he had gotten far enough on the bridge, he wouldn't have this now. He wouldn't have Joanie and be able to laugh - just laugh over the insanity of their lives.
And sometimes that was all that could get you through it. Through the whole building's crazy, the fact that a few days before his counterpart had tried to kill her, that he nearly killed himself. Humor was the solution and for this moment, Luther could appreciate that.