There is a glitch in the spar arena where you are sometimes put into the a spar without an opponent and your turn gets skipped over. Instead of getting booted out of the spar, you are forced to sit in there until you either die, unstick, or restart the application.
It is bothersome to keep waiting in the queue(especially if it is long) just to be forced to restart the application. It is common enough to be worth addressing, so here it is.
Here are 3 people glitched while two people spar
Also, it can be abused to interfere with spars.
Picking up the start bomb...
...and throwing it at a sparring player
Thanks,
-Masa