I've never tried getting help to kill a boar. As for chasing you, some enemies may have less stamina, so have to give up, or their AI has some limit on how long they chase you (to simulate a lower attention span, etc). Also, some creatures may be designed to be territorial, and not stray too far from their original location. Undead may be stupid/single minded enough to follow you forever, and others may try to catch up as long as you remain in their sight range, but this could also be a bug.
That sounds likely to be right at least in somme cases orcs would be stupid trolls and thugs bees could be territorial .
Trouble is not only will no one else kill the boars but they are also one of the things that follow you the longest they even follow you into houses and wait for you even if you escape down a hatch never seen a game with such a persistent enemy before. thats what made me think the Boars were bugged since they are one of the few that pusue you almost anywhere and for any amount of time and also they were the only enemy that no one else would kill although no one kills bees either.
