Not only large trains, but mobs which are (ideally) deep red to you. If you pull stuff that's around 6 levels above your own, you can still land spells and you'll get massive exp for each kill. The con doesn't matter because you're never getting hit and have no resources (except HP) to waste.

Interesting, thanks for the tips Delvesh.

Hard to get out of the mindset of "only kill blue mobs" when on a bard. I see red/yellow and still get jittery or feel I should leave them be.

I had not actually seen that advice yet about not zoning off the higher level mobs and just going to pick up a new swarm, good stuff.

To drive that point what I find in BW now is that the first 75% of the mobs that die give me about 25% of the pulls exp, the last 25% that die give me the other 75% my exp but they take 2x as longer to kill. Math says make sure you stick with your kite to kill the hardest of the mobs.