Game Mechanics: More than 4 npc's shouldn't be able to attack a target at once

[Dolalin]

I think it's useful to separate the two theories in this thread:

1) That only 4 pets could attack a mob: this is pretty well evidenced for existence and eras

2) That only 3 or 4 NPCs in a train would attack a PC: not so sure about if, and when