I was just messing around in a 2v2, playing ring around the pillar with a rogue, when I caught him in a fear. He ran straight through the doors. I tried to replicate it, and only got it to work one other time.
I'll try and get a screen shot of where I was standing.
I checked the bug forums over at wow and found a couple people complaining about something similar.
WoW Forums -> [BUG] Fear in Arenas. (With PICS!)
Sorry, If this is a repost. I didn't see it in a search, but I also didn't look that hard for it.