When I was first charged with infecting someone with vampirism, I was happy that it was included as a quest. Now I feel different, because out of the six times I've been given that quest I've only been given three different targets. I killed the first one just to fail the quest because my save was too far back, but now I just reload the last autosave and try to get a new target or quest. Now it seems I have to do it, and Vingalmo will only give me targets I've already infected. Is there a way to keep this from happening or do I just have to murder these people?