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You would need to adjust the script his character uses. Speed up the animation from there. SetAnimationSpeed(e,v) is what you will need more than likely, where v is the speed you want (in fps).
You can increase the damage by changing this: HurtPlayer(e,1) to a higher value.
Make sure you back up the script before messing with it
You may be able to simply speed up the anims from the editor in his properties, bu that will speed them
all up, not just the attacks.
SPECS: Ryzen 1700 CPU. Nvidia 970GTX. 16 Gig Memory. Win 10.