"Friendly" Wither Skeleton

The "Friendly" Wither Skeleton is a Wither Skeleton Ilsa finds when she visits the nether.

Appearance
The "Friendly" Wither Skeleton is a dark gray and black skeleton. It is equipped with a stone sword.

I went to the NETHER :( (episode 3)
Ilsa finds a wither skeleton and mistakes it for a pigman. She gets closer and sees that it's a wither skeleton. It doesn't move to attack her. She gets closer. Nothing happens. She then gets too close and the wither skeleton hits her. She gets sad saying that she thought she and the wither skeleton were friends.

Trivia

 * Ilsa's nether may have had a bug, which is why the wither skeleton didn't move.