I have had this happen to me multiple times I'm fighting a Lumber type enemy he begins his tel of winding up , I run as far as i can from him and then when his swing comes down I am magically hit with his stun and full attack damage as if I had just stood there waiting to be hit, I have also tested it with other players and seen that the same happens to them, He locks on, begins winding player runs for his life then bam hit.
Seems more like a lag issue