Mobs aggroing onto you from other players

run past some guy fighting 3 mobs, do not engage that in any way, then pull a bunch of mobs,I go immune all of a sudden my mobs charge across the map and jump this poor guy.

fighting 2 mobs +minion add next to a paladin who is fighting 2 mobs, for no reason at all my mobs suddenly stop attacking me and jump him, ask what he did to pull the mobs like that, sadly did not respond to me.

got to wonder if this post is related?