Post nail the rotation is a lot easier and threat is usually unimportant. The pattern is charge phase -> void zones -> stun -> void zones -> void zones -> knockback -> stun -> charge phase, iirc. After he lands from a charge I fish for blocks with Bulwark so I can Shield Swipe the ring of fire void zone things. It's especially helpful towards the group to get the middle set, which I think is the first in the pattern. If I'm worried about threat at this point I just unload between the first stun and the knockback after the last set of void zones, ignoring the Shield Swipes.

Hope this helps!
I can't believe there's a 1000 character limit on posts.