Suffice it to say this entire event (triggered by equipping the Corrupted Ashbringer and having the Ashbringer Aura active) is completely unscripted. I could give details, but it's far far easier to just link the wiki page.
Suffice it to say, the mobs in the cathedral instance are supposed to be friendly to you when you have the aura, and they aren't.
Suffice it to say this entire event (triggered by equipping the Corrupted Ashbringer and having the Ashbringer Aura active) is completely unscripted. I could give details, but it's far far easier to just link the wiki page. Suffice it to say, the mobs in the cathedral instance are supposed to be friendly to you when you have the aura, and they aren't.
Source: http://wowwiki.wikia.com/wiki/Corrupted_Ashbringer/Scarlet_Monastery_Event