The obvious reason is because you get to play rock-paper-scissors.
The less obvious reason is that after a certain number of back-and-forths, you can interrupt the other person saying "aft-", cut them in line sideways so you both sort of swoop through the doorway, which then leads to a warp zone.
The less obvious reason is that after a certain number of back-and-forths, you can interrupt the other person saying "aft-", cut them in line sideways so you both sort of swoop through the doorway, which then leads to a warp zone.