We were doing fine, had him losing HP faster than you could count it, and destroyed all the nails within 20 seconds..and he immediately teleports to the center, skipping all animations, and Hellfires, instantly one-shotting half the group for 2.8-3k damage.

I mean, seriously, as if the badly programmed laggy cracks and lava weren't bad enough, does he really have to randomly do crud like that?