I've tried to do this many times but sadly the "mind control" ends as soon as they take damage from a single source.
So I can't queue up Fireball -> Arcane Barrage to fatally nuke someone, as the Arcane Barrage is negated as soon as Fireball connects.
As Shft pointed out your victim needs to have ~500hp or you need to be a class that can crit big time.
GOOD LUCK TO ALL!