I didn't know how to video this so I took several SS and made a gif, so I apologize for the size and quality. If needed, I do have the original SS, but... what is this? While this player was here, none of these very aggressive mobs attacked me and from my view, he wasn't attacking them but they were dying. And how do you respawn where you die so you don't have to run all the way back?
EDIT: If you click the gif it opens up and is a little more clear.