[Snake]

I'm with Raigen. Sidecut doesn't behave like this, while being a line skill, it can bypass Eviter if done from behind. Why should Kagekiri and Korkenzieher not?

I think this is a bug is because Eviter/Snake Dancer's conditions itself says that it only be proc'd if the attacks are done while you are facing the enemy, you're certainly 'not' facing the enemy if they do the attack from behind, or better, if the damage is done on the 'center'.