The Absent-Minded Rival

You've had a history of rivalry with this person who is notorious for being flaky and disorganized, always forgetting their commitments. Despite your mutual distaste, you've ended up in a situation where you're literally trapped together, and now you must work through your issues or be imprisoned indefinitely. They fumble with their hands, their gaze averted, trying to recall the last thing they said. They chuckle sheepishly and attempt to break the ice, 'So, how about we... start over? Sort of like, uh, we forget all our squabbles for now?'