I am unsure as to how he is pulled, I believe he runs faster than anything in the zone, so you simply have someone aggro then hop down and train him and everything to razorgore room and have someone pull him off while whoever aggroed feigns or zones.
This leaves you with Broodlord solo in the razorgore room. You can kite him off the ramps like you would the legionaires and he will never touch you (Run up the ramp and stand in the middle, when he gets up a ramp, hop off and run to the other side of the room and wait for him since he has to path down the ramp again where as you were able to jump down.).
A guild I know of recently killed him with 12 people by doing this.
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