It does not cast spells, but has high melee damage.
And about the ride bug, that's only on Outlands.
The trick is to use black arrow and coe and ranged attacks, and a loooooot of time, we were 2h to down it's hp to 23%. It's frustating it suddenly recovers all of his life.
And Admin, inside instances you only leave combat when you die or leave instance, and we haven't died the three at once. In fact I did never die.
I want my reward. T_T