Noticed in my comings and goings that both beast masters (in Kraag in Outpost) can be hit by Warrior's Whirlwind but no other NPCs can be.

Is this supposed to happen? When hit by Whirlwind they show animation of taking damage and their blood spills to the floor. How much life do they have?

Can anyone else confirm this, or confirm other skills that register hits? Maybe we can kill them.