If I found a solution to a bountied question using a suggestion in a comment rather than a separate answer, how to I make sure the commenter gets the bounty at the end of the day?
For example, I solved this post recently based on one of the comments. The person commenting had posted an answer earlier which didn't work, so I don't want to accept that one as the solution. However the bounty expires very soon, and I really want him to post his comment as a seperate answer. But without any method to be able to PM users all I'm able to do is add another comment suggesting that he post a new answer.