How to attack so fast in dead island 2.

First you need the block skill this is why we use Ryan or Carla they unlock block first I recommend using Ryan. Then once you make an attack on enemies block immediately to cancel the rest of the swinging animation. When blocking it makes your weapons swing faster than usual. The other slayers are not usable because they unlock dodge first.

If you still don't understand then oh well just keep practicing and you'll get the hang of it.