Our party just encountered a glitch where we got stuck in the door after moving across the field and remained invisible while Diabolos went on a rampage.

The cause I'm pretty sure is that one member had died and waited till after the Diabolos AoE to revive so he was alive while we were still moving to the other door.

I think because not all 4 members were available to exit the door, we remained invisible.

I know this is probably a rare occurrence but I would hate for it to happen again, till them I'm not revive people till after we get out of the door.