Got another problem with a quest…..

I feel stupid asking another question about a quest right after another question from another quest but I don't think it's my fault.

I was doing the "kill the orc partol quests" and actually slayed both the farm orcs and ones by the boars. Only thing is they didn't die. I faught them and after being down for about 10 seconds they got back up and told me they would "get me next time."

I've accepted the quests and they are in my inventory but once I beat the orcs and stole thier weapons it didn't say complete or anything.

So what am I doing wrong?

You need to do a finishing move; hold RMB and LMB.

The method which worked for me was first hold RMB and after about a second press LMB.

Alternatively archery or magic can finish them off.