I've reloaded several different save files, even ones pretty far back, and got the same result. I've lead with all my characters and the same thing still happens. Previously when entering the Pontius area, all I do is hit the switch to open the entrance way. I walk in. I move my characters forward and whenever they reach a certain point my characters stop as if they were about to be initiated into dialogue with Pontius, but that never happens, and then I move in and try to attack him, after doing that for a little while his minions show up, also the character I control when entering the room never engages in combat, and is free to roam around wherever.