They love to run away or to behind a wall to don't let you finish your cast when you finally made it. And different as a dps that can recovery hp, we basically don't do any dmg at all. So the only thing that always happend is the time runs out and I win or I lose it. The no cost sprint plus you can't cast a single spell even when you use your pvp ability, is what is making Ast so strong. Not actually the shield as the most of dps are thinking that can look like because is so easy to interrupt a healer.