Okay to do this you need CT Raid, and must be a spellcaster.
Lucifron has a debuff that does 2000 over 8 seconds. Well, there is a way to avoid it. All you have to do is for example a warlocks shadow bolt is the same range as Lucifrons debuff. Get as far back as you can from lucifron but so you are able to do shadow bolt. CT raid will tell you when the debuff is coming so all you have to do is move back one step and everyone else gets hit with it but you.