Within the army of the Brotherhood, a voluntary forfeit will be rewarded by an instant and merciless death from my own hands. If Anomaly handles it the same, we can easily settle this point.
EDIT: as Bloodaxe stated, this won't probably happen. I don't expect that anyone who drops out would admit that he did it on purpose.
Still, the case of unvoluntary forfeits remains. I hate killing the original warrior and I hate it even more to have some follow-up stuff, that would be a major pain in my ass. So I still opt for doing nothing.