Doing extra damage while he goes after a brindle and tries to kill it can prevent him from killing a brindle, and make the fight quicker. Self buffs on gear can help do this while he is in that mode. The more brindles he kills the more resistance he has to taking damage.
There are 5 brindles in the arena with Lannox: Merten, Marlis, Otes, Melly, and Vondie. Once all 5 are murdered by Lannox, each successive attempt to murder will simply increase the buff immediately. Therefore, it is very important that you either kill Lannox before that happens or do not allow Lannox to kill all the brindles.
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