I was just monkeying around on my rogue, sappin guys and i ran into Lieutnant Valorcall and found that if you sap one of his men, you can kill him and the 2nd one really fast (as soon as you kill one, he respawns next to the guy you have sapped) loot and repeat, i killed them for about 4 minutes straight on my 52 rogue so the level gains might be a bit off, but maybe if you have 2 rogues you could do this nonstop.