[Lazortag]

It works, though I never did it on Live so I don't know how it compares to classic. You can charm a mob in a swarm, send it after a mob in the swarm, and then run the swarm on top of the charmed mob and the swarm will aggro it (if that makes sense). I believe on Live you wouldn't have to do the last part as they would aggro right away. It's fun but not as fast exp as you'd expect, and it's somewhat skill-testing since you have to time your hides/invises very well (especially with backstabbing mobs like spirocs).