How are destroyers hitting like 80%hp in 7secs.

[NueHoujuu]

I saw the video, and now I saw it happen to me in arena.

 

How do they do this. How do I avoid this. It seems as if they stun me once and then can suddenly do this.

[Pikia]

fury + animation canceling, you have to be careful not to use all your escapes against destroyers or you'll get nuked if they catch you without one :(