This is useful if your farming badges for the justice point xversion and can't stand certain heroics.
Bailing after the first boss of any Heroic is killed, or logging so they kick you offline, doesn't give you the 30 minute deserter but puts a 15 minute hidden cooldown on using the random Heroic finder.
An easy work around for this is to kill a boss or log during any heroic. You can then queue up and kill coren direbrew - the quick kill will reset your hidden cooldown for the random Heroic. You can then just queue right back up using the random LFG tool.