Here a new user should have added a comment, but mistakenly started a new answer. Charles (correctly) moved the user's response to be a comment rather than an answer. I know Charles is a moderator, which brings me to my question. Is this sort of maintenance restricted to mods? Or is this something that I can fix on my own? If so, how?
As far as I can tell, it's only for mods, but maybe users with high reputation can also do it (although with your reputation, you're already a "trusted user", I don't know if there is a higher level. In any case, that what flags are made for: if you need to move an answer, just flag it "this should be a comment".