Crystal realm (monk seam) gladiator glitch

[Disorder]

I rolled a pc out of curiosity to check that place as the class its designed for and saw next problem.
There's a "Novice" npc that functions like a gladiator. Upon talking to him and agreeing to fight he might glitch. You follow through and end conversation where he mentions that he wants you "to meet by the crystal". You follow into appropriate area, enter what appears to be arena and the npc follows you only to the arena border, but doesn't enter it.  He stumbles upon the wall that separates area for fighting from the rest of the place.
Theoretically you can still finish match by using sling, but I don't think it's the way the match supposed to happen.

[Disorder]

This still persist.