Sorry about the amount of pictures, if its too many i'll take some down, or just put the link up.
These are some screenshots of being inside the Armsman Arena walls, you can use this to jump into the arena with the rest of your group even if the gate is closed.
(They made the arena instanced last patch, before i used to put Idol of Set and Storm Field up and stood next to the quest giver killing everyone )
Pics on where to jump on there way, just gotta get in there.