In Zul'Aman are mobs (can't recall their name atm) that spawn Armani Bear Mount.
When they reach around 20%, the rider gets off their mount, and the mount comes to aid. Those mount mobs use Crunch Armorm, a debuff that reduces the targets armor for 20k, and because it is used on the tank, ouch..
I noticed, that when our group stuns the rider mob, he does get of his mount, but the mob won't spawn at all.
Make use of this, because it will be fixed.
Wipes will be prevented.