When you say "sensible direction", what do you mean? I tank that boss with my back against the wall. The dps/healer would have to be right on the wall with me to get hit by anything. If they took that effort to get onto the wall with me, and cramp up their camera, then they are probably trolling. If they were standing there, then I would kindly ask them to stand in the middle. If they did not move after me requesting it, and telling them of the AoE attack, then they are obviously trolling, and I am leaving.