Guild Wars 2

So, it took me a bit to notice what was going wrong, but, last night, some of my buddies and I were fighting Vale Guardian. We tend to play a strategy in which the Tank rolls backward into the barrier to dodge the blue teleportation circles without moving the boss. However, the tank kept dying when they did this. Turns out that the barrier that springs up around the arena that you fight the Vale Guardian in wasn’t activating when the fight started. It was activating after the VG completed the blue teleportation attack.

Anyone else encounter this problem?

Yeah but it has always worked like this. After first blue circle attack the wall goes up.