Originally Posted by
JOHNMADDEN
yeah, heres how it works. when you hit the boss, you reflect damage back to yourself of a % equal to his current energy bar (while in Cowardice phase obviously). however, the damage reflection is applied as a 6 second long dispellable magic debuff, very similar to our own Ignite. If you hit the boss with multiple pyros or have big dots rolling, just shout for a dispel right after you hit him. On my warlock (my main), i've thrown 500k chaos bolts at him while he had 95% cowardice energy, but as long as you get a quick dispel you'll be right as rain.
The primary reason why a lot of people don't know this is the dot is instantly re-applied as soon as you deal more damage, obviously, and the entire raid has it, so no one ever considers it a dispel priority; it would simply be too much to keep up with and healing is a lot easier. but if one or two people KNOW they're going to have extraordinarily large dot stacks, you can call for a dispel and get it cleared right off.
(Disclaimer: this info applies to normal mode. no idea if its dispellable or even a DoT on heroic.)