Arena bug happened again :(

I was helping friend in arena and this unpassble wall bug happened at last boss.
Boss Frosty with vortex crystal.Attachment 52198

Me too got this fix it please struck at middle :'(

The same thing happened to me today for three times. All of them were frostir.
Basically, we all died and were locked out. We were not able to re-enter the arena. and yes, they were all the last boss that we fought.

I hope we should get fix of this...

apparently the bug is not only on frostir. It also occured with captain rutgers. When it happened, he wasn't the last boss. -.-"