The Felrage bug goes like this, if you get the felrage buff/debuff, and you're standing under something that'll prevent you from growing to full height of the effect, the buff/debuff is canceled.
In the case of Vexallus, there are 2 candlestick just below the staircase to the boss. If you have range dps standing right under the candlestick, they cannot grow to the full height, thus the buff/debuff is canceled.
For someone who've run this instance 15 times (last time was 3 alts, 2 mains nightmare, we end up gearing the alt shaman healer with EVERY single piece of the drop), this is something interesting to considered to speed thing up a bit.
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