So, I decided to buy the AA on the off-chance that the ability might be nice on a fast burn fight like Vitio. I didn't want to test it on Vitio so I decided to test it during one of the new group missions. We did the one where you have to stand at the statue in the pit fighting bokon. Our group spawned the red con boss bokon and hit Scarlet Fang on inc. Group knew I was going to test this. We're all Arx geared. All OOM in ~25 seconds. Casters used mana recovery tools and that's the only way we were able to finish. Sure Scarlet Fang did what was advertised. Melee were twin casting skills and abilities and casters also. Cleric loved the twin healing power until he realized he was OOM. During that ~25 seconds we dropped the mob to around 20% I just don't see how this AA would ever be usable. We burn Vitio like hella fast but not in the time it took us to go OOM from Scarlet Fang. The endurance drain was minimal during te engagement but the group make up was only an SK, 2 Rangers, cleric, wizard, and druid. Not sure how much of an endurance drain it would be on a monk/rog/ber. Any way this AA is an option for anything?