Experienced bug while fighting Amon in Syrcus Tower

During my second run-through of Syrcus Tower, when we reached the Amon boss it became bugged and none of the mechanics in the fight happened. Everyone literally attacked him from 100%-0 with no additional enemies spawning, no special moves being cast, as far as I could tell he was just auto-attacking the tank, possibly not even that. There were no mechanics to contend with and it was essentially a free win.

The Summoner in my party also reported that during this fight his DoT skills weren't functioning correctly, only lasting 1 second on application.

I don't know if it's a cause, but the boss was pulled by another Summoner's Garuda-Egi, before being provoked away.

This happened to me last night, too. Not sure about the summon thing, but Amon just stood there doing nothing while 24 adventurers wailed on him. Primal data center, around 10:30 PM Central time.

I had 2 separate Syrcus groups that had this happen. I only ran Syrcus 3 or 4 times so I hope this glitch gets fixed soon! Amon's fight was the most fun too :(