Black Knight fight/arena issues

The Black Knight used his beam for more than a minute so I decided to log out and re-enter the area.

Then I just got stuck in the inner wall. I can attack, cast, but am unable to use any of my movement skill.

Thank you in advance for your work on that.

He used his "Not many live to see this technique" sunder-esque attack, which pushed me into the outer rocks. I can't use movement skills to escape. I can channel charged dash but it does no damage. The Black Knight can't attack/hit me either. Golem doesn't target him when summoned. Can't use portals to tp out.