The biggest problem here, to me, is the speed, range and staticness.
I think the attack would be better if one arm pulled back, the torso twisted, whilst the other arm came across the chest, then have the character lunging forward, plowing the arm in an arc away from the character, whilst having the character pivot and shift its weight from the hind leg, to the front leg (mid pivot) then to the new front leg.
I hope that makes sense.
I think an attack like that would add a lot more character to the animation.,