Game Mechanics: West Karana Barbarian's bugged?

[hyzon]

I've recently hit 24 and decided to camp the barbarians in the corner near Qeynos Hills > West Karana zone.

Lars McMannus kill gave me experience:

Misla McMannus
Brenzl McMannus
Sera McMannus

All just die, fall through the world to where I can't click target or /target corpsename their corpse, and don't yield experience. They do however yield the 4 negative faction hits properly.