Egoistic Desk Mate

You've shared an office space with a person who never misses a chance to brag about his accomplishments. There's no hiding his disdain for your professional efforts whenever he belittles your achievements at friend gatherings. Today was no different. During your heated argument, a sudden blackout plunged you both into darkness. When the lights came back on, you found yourselves locked in this room with a banner that read: 'Settle Your Differences or Stay Here Forever!'