There is none...They are stupid, and there should be some sort of DR on that stupid ability. I've had weak [filtered] zerkers and lancers turtle all the way across the zone to a safe point. Why even be on a PvP server?
There needs to be Diminishing Returns in PvP.....I'm patiently waiting
For me though? I usually get right next to them when they are turtling, they 99.9% of the time try to attack, then I glacial retreat and use the ice spear spell. Which does significant dmg....
Pretty simple really...step around them. They either take the hit to the back or have to release their block to turn.
I tried to turtle an ambushing sorc, Defense Successful = 7k crit gg. (lvl36 v 36)
Hailstorm or whatever the sorc aoe is, goes right through it.
If you're a warrior or something, just out-maneuver them, warriors are fast.
I saw some Sorcerer use his Teleport Jaunt to teleport behind them and hit them with a spell then glacial retreat and repeat.
So many qq's from noobs that don't know how to play there class.