Spoke to both our resident wolf expert, RumbleAlex, and asked Marco about this already, but just reporting here for record:
Werewolf Twisted Claw skill seems extremely awkward. As I'm told, it might be the same issue as wychwind where anything directly on the target takes extremely small damage, but I can also clearly see that the tornado only hits the direct target and maybe one target extremely close to it. The hitbox of this needs to be much larger, at leat to the current tornado width or make it a bit wider along with the tornado. Any moving targets will hardly take damage because they walk out of the hitbox immediately. Even big bosses like Azmodan wander out pretty easily.