I remember them making the mob run at you for just a second or two. Now I just get immune.
Very possible, there are numerous in consistency in this game.
Everything from noticeable differences between my horde and alliance characters who are geared and set up identically (in 2019 classic to now in wrath) regarding how RNG tends to favor my horde characters in a noticeable way, cant help but think this is likely intended.
Even dumb stuff like not being able to buff certain “friendly” NPC that were indeed something I use to do to screw with the enemy (enemy to the faction I was on at the time)