Why do people not understand A8?

[Dramatic]

I still don't know what to do when the AoE circles and Arrow drop at the same time in A8 last phase.
For some reason I always die.
It's super confusing. At this point I think it's because I'm going in front of him and getting hit with something, but I still can't be sure. Thankfully I'm the only one that dies.

What we do is stick a B market in front of the boss, an A marker to the right side, and have the tanks opposite B with the boss facing them (back to us obviously). Everyone stand at B to bait the AoE's there, as soon as the markers appear and someone is targeted for the damage share we all run to A to avoid AoE and soak damage. Once the shared damage has been spread run directly through the boss to avoid his laser/beam attack and scatter to avoid the jump. When he's back in position return to B and repeat.