I always drag the last guard (not the first boss, but the stationary guards) into the area while I setup, either I fear the guard or I sheep it. Then I set my group up on the side somewhat spread out. Totems, imp in range, etc. Then I execute the last guard and begin the event.

If you look at the aggro levels, the dragon does have threat before he hits the ground. I just toss a avengers shield or similar attack at him as the tank for sure.

Strafe move out of the fire, don't be pinned against the wall.

After fears have your group rally to a specific character, not your tank. Likely after fear bombs there is way too much fire on the ground that you will run through on the way to your tank ... and that is something you need to not do anyways.