When I did it the first time we got it just fine because everyone listened. Then on one of my following characters (I believe my elementist) I was in a group of 3 W/*s (I know bad choice) 2 of them aggroed the ember bearers (despite repeated warnings) while me and the other warrior were standing well back cursing at them. We were letting them die to be resed later. After it was safe we resed one and he immediately reaggroed them even though they were on their way. He died. So we didnt res him for a while until they were far enough away that the mentality would kick in and say not to aggro. Despite this the one remaining ember bearer made it to the gate and we still got the bonus.
