Okay, first off, I am NOT 100% sure this is how or why he bugged like this, but it's the best theory I have and makes some sense if thought about in this way, anyways let me begin...
The last Curator fight my guild had, everything was going okay, except we had one of the trash mobs(The voidwalker looking guys) bugged on a pillar, he evaded so we couldn't kill him, and he wouldn't un-bug. So we just said, the hell with him, and tanked the Curator away from them.
Well, someone walked too close to them, and they aggroed, but were still evade locked. HOWEVER, The Curator began acting very very weird, the tank(me) lost aggro almost instantly to a mage who was soaking up his arcane damage(I was well over 10k threat over the mage), he didn't stay on the mage long before changing targets yet again...
After having him swap targets, basically ignoring aggro(The offtank seemed to pick up aggro after just 1 or 2 sunders, and I picked it up anytime I used a judgement or avenger's shield) we noticed that his mana was going down as if he was summoning sparks, except none were spawning, he DID NOT evocate at all, when his mana hit 0%, it stayed there for a moment, then jumped to 50%, and proceeded to go down as if he was summoning sparks.
So, in conclusion, we actually got him to 48% like this, without a tank, with him randomly attacking people, and found that it was(in a way) easier, though when he enraged he'd surly 1-shot any non-tanks.
It's not really useful, and it requires the bad luck of a mob being trapped on a wall. So if you're still runnin' KZ, and a mob happens to be stuck on the wall, make sure NO ONE gets near it, as these mobs apparently have some way of making The Curator attack random targets(as I assume they do with the mana wyrms pulled with them).
Sadly, no screenshots as I was the main-tank and was kinda busy trying to get him off the DPS, and they weren't my prime concern.
If people demand screenshots of where the bugged mobs were, I can emulate it on a private server(as it'd be impossible to recreate bugged spawns on live.)
Sorry for the long post, little reading is never a bad thing though. =)
'sides, if you're reading this paragraph, then you made it through okay and you're not dead. ^.^ So yay!
PS: Don't cry and say "wall of text crits you for blah blah blah", it's correctly spaced, and not that hard to read.