I encountered a graphics glitch during a fight agains the guards at the big iron gate of Fort Joy. One of the melee magisters used his phoenix dive to teleport next to the red prince on top of the wooden scaffold. His "physical" model appeared BELOW the scaffold (partly inside the wall) but that did not prevent him from attacking the lizard some meters above. He could not be targeted in this state. Finally, I moved the prince away (triggering an opportunity attack) and when the magister followed he was back on top of the structure.

I admit it is not easy to spot on the screenshot, but here it is:
Link to screenshot on Steam