Also requires you to be able to hit him the moment the bar shows, it disappears so quickly that if you're in mid-cast, have a conjured weapon up, not in the right attunement or have brain-delay (;_
then you may miss the chance to break it.
That said, I didn't try it but Sword Water 2 may have been a good replacement for burning retreat. Not as fast but if you can hit a dodge right after, you may get far enough away assuming you do it the moment you see the circle on the ground before/when he jumps.
Still, in general, it's a pretty bad fight when party members (who can't actually fight and the boons they do can be taken from you) and ranger pets/minions/etc can mess you up. If it's not changed, I may go Soulbeast instead of Druid for it since I can merge me and my pet that way.