I was thinking more of a full party wipe, when everyone is killed and no one can fight the boss, so you have to release, when the boss resets, your cool-downs are reset (or greatly shortened) until the fight starts up again. Naturally this would be mostly limited to contained instances like raiding or trials rather than dungeons (as that could be exploited rather easily)
I'm not really giving an absolute answer here, just a possible example of how it could be done.
