You plant C4. When there’s <10 seconds left, whole enemy team (with an engineer) runs to disarm it. All your team has to do is distract them for a few seconds. They could just run towards the enemy, shooting in random directions, all die without killing anyone, and that would be enough. But no, death in DB is to be avoided AT ALL COSTS, so the C4 of course gets disarmed with 1 second on the clock. Gotta maintain that positive K/D.
And this repeats 3 times in 1 match, when you have a 4500 Game Mode XP mission.
It was painful to watch.