In polish forum user Lotar posted a picture where we can see his dead buddy and a text that says "Lotar zabija gracza Malinowy95 przy pomocy umiejętności Strzał bolasem". It means that he killed his friend Malinowy95 by using Bola Shot. Here is a picture www.fotosik.pl/pokaz_obrazek/pelny/12cc79168b9d3447.html and this topic eu.battle.net/d3/pl/forum/topic/4211002145
Strange bug or maybe it left after some test PVP in PVE mode?
I don't think we can play it, but i think it's interesting, because blizz said they never planed or tested to do PVP in normal game fields. Maybe they changed their opinions about it. Have you seen something like this before?