For when you are surrounded by 40 nightmare thrall and the game believes it would be in your best interests to try and punch one of them
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More evidence that they* don't play their own game. If anyone* at Bungie had experienced this, it probably would have been fixed. *I'm referring to those in charge, the decision makers. I believe most Bungie employees play the game (when they're not being overworked to complete underwhelming content) and probably have the same complaints.