Guild Wars 2

I am confused about whar Link said in todays live stream abot the columns in the arena of Lost Precipice. It’s mentioned here:
http://www.twitch.tv/guildwars2/v/20972084?t=128m30s

Are these columns permanent or are they some of those you can add/remove?

I think he meant the columns around the edge. The stuff in the middle of the circle was decorations. In previous tours of Precipice the circle was empty.

Ah, this makes sense. I thought about the middle ones because Rubi mentions LoS although the outer columns don’t seem to leave enough space to hide behind them.

This means both halls shoud be suitable for GvGs.