We killed Vangl and, weirdly, OMM spawned right on top of us, and started stutter-stepping his way up to the middle platform. He would take a few steps, stop. Then a few seconds later take a few more steps. Once he got there, the barrier-wall that was raised (raises once Vangl dies), RESET, locking us out, and prevented us from speaking to OMM and starting his fight. All other bosses were dead. We did our clear the same way we do it every week.
This happened to us. It is possible to shrink/illusion through the wall. You can have someone do it and start the event, then pull him out by healing that person. In phase 2 when you click back in, the wall will still be down. You can agro him through the wall and he will summon that person. Have them move him all the way as close to the wall as possible and you can kill him through the wall. It is a pain but still possible to kill him. The time it happened for us we had a Ranger 2.0 turn-in mob up but no clue if that contributed or not.
We did not try kicking the DZ and re-requesting and clearing to back to his room. This should technically be possible, but we still had our replay timer running, so we were able to get him down using the above workaround. He's only glitched the one time on us. Not really sure why.
