The Malevolent Strikes mechanic states: "Halfus' attacks wound the target, reducing the effectiveness of any healing on it by 8%. Stacks."
What troubles me is the ambiguity of "attacks." Does this mean actual physical contact with the player? I ask because in both cases (normal and hard) this debuff is being stacked when the tank dodges, parries or blocks an attack. The thought, initially, was that the tank(s) with the highest avoidance would be best to have Halfus, but this appears to be incorrect as the debuff stacks even when the attack is avoided.
There are some (esp. warrior) tanks on my server who state that block-tanks are predestinated to tank Halfus because every time they block an attack Malevolent Strike cannot stack. By my experience and after evaluation of several combatlogs I doubt this. The only thing the combatlog says is that the attack can only miss. It seems that the attack cannot be dodged/parried/blocked.
It may be possible that Malevolent Strikes is a separate ability from a normal swing, though that is purely speculative.
The tooltip claims the strikes to stack from his attacks, but if there is indeed a separate attack without an animation that can still be avoided, I assumed that this would be documented.
I am not especially troubled by it but I am really interested to hear more opinions on this.