Was doing a random normal dungeon, and surprise, we had a speed runner.
As we started to fight the first boss, the speed runner aggro'd the second boss further in the dungeon, and thus the loop began: we would be teleported to the second boss, then we would be teleported to the first boss, then the second, then the first, and so on. So I had to leave the group and instance to escape, and now I have to wait another 12 minutes to queue and try again.
Please remove this from the game, thanks.