Gunner Stuff

It all depends on the monster's own aggro. Only Taunt breaks the aggro of the mobs.

I thought it also depended on the skill too? I mean, Fireball, Thunder, Ice Spear, Act 7: Climactic Crash, etc, etc, so forth provokes Skeletons, which are single-aggro mobs.

Does it? I'm pretty sure it just puts them into alert state so they may aggro one after the other, but they should not all aggro and attack at once.

Tested, Shooting Rush causes normal aggro, so if you Shooting Rush a group of skeleton lancers and archers, two archers and two lancers will aggro you. BUT, if you shooting rush a monster in defense, once in a hundred attempts, it will reset its aggro. Also, Bullet Storm on the other hand, aggros every monsters it hits.

Wait I thought Bone Lancers are single and Bone Archers are double? That is, only one Lancer and one Archer is supposed to target you?

I may have been wrong about that, either way, Shooting Rush is normal aggro and Bullet Storm is all aggro.