I've been doing the solo Thunder Forges scenario where you help Wrathion create the lightning lance. I've done it already once on my Druid healer with no problems and completed it successfully. As a dps now however, on my Rogue, I am finding that during the part where the Celestial Blacksmith is charging the forges, the Celestial defender tends to die a lot just before he Blacksmith activates the final forge (as a Rogue I have no way of healing either the Blacksmith or the Defender, apart from bandages, which I save to use on the Blacksmith to keep him alive).
My problem is that the Celestial Defender tends to die just as the last of the forges are about to be activated by the Blacksmith, as by this time the Defender has a lot of adds beating on him. I am finding that if the Sha Amalgamation manifests whilst the Defender is dead, then the Defender will not respawn. The forges all reset, as intended, but the Defender doesn't reappear. Without him to tank the Amalgamation, completing the final phase is impossible.
Is anyone else having the same problem? Is this a known bug/issue - or simply me having really unfortunate timing when I've been doing it?