I'm not sure, if it's a bug or a feature.

In 99% of cases if I attack one on the bounty list, I get the result of the first attack, and if not killed I can not attack again, because I get the message no longer on the bounty.
So I can not kill him, and the money someone else gets. In the other 1% I get the message, is in a fight, so I was too slow.

I have seen this many times now, no chance to claim the bounty.

Patric