A bug with Demon Wall, seriously

[Steeled]

As a tank, I'm encountering an increasingly more common bug with Demon wall. I don't fall off (well, I did once, but this isn't that).

When he uses repel, sometimes I seem to evade the attack. One of three things happen:

1.) I get sent back to the entrance of the fight (this is most frequent), inside the barrier, charge him again and go back to tanking.

As Alerith clarified for me. I don't meen that I'm getting repelled. I see a very short black screen and the game puts me at the entrance of the fight.

2.) Nothing at all. I don't budge. I've probably evaded 50 times and this has happened twice.

Some people say that taking 0 damage is causing this. Stoneskin. That's neat. Did not know.

3.) Nothing happens til after I move. This has happened once. I didn't get knocked back, everyone else did, and so after about a second of scratching my head, I moved over to the side to dodge the center strip and then was knocked off. This was very likely lag.

Has anyone else been encountering these? I would very much appreciate it if they just made repel un-evadable so that you always received the knockback.