Blaster Beam Rifle doesn't benefit from Defiance's mez resist while flying

[Monkeyking]

Blaster Defiance allows the first two attacks to be fired even while mezzed (I think this is actually baked into the attacks, rather than a function of the inherent power). I have observed that Beam Rifle's first two attacks can't be used while mezzed if I'm flying. I'm wondering if this is the animation engine being weird, and the flying animations of these attacks not being rigged properly.