I say this to everyone:

That entire fight is like a really bad Mario Party Minigame of dodging things or dying, your positioning is really key here.
I'd say that yeah this one puts a lot of pressure on the healer and this is easier said than done but to the rest, please don't stand in things you shouldn't. Don't get run over by the horses multiple times. I agree with the one that calls this fight a Healer check but it can be less strenuous on the healer if everyone does their part. This is a fight where it can be fairly easy to panic.