I've flagged a couple of answers lately that got marked as invalid -- one for an answer that wasn't, and the other for one that was. I'd like to get some feedback on these flags, so as not to waste mod time on invalid flags in the future.

The first: an answer that was turned into a comment that turned out to be, basically, the accepted answer. In this case, an answer was provided in the form of a question, Chopper3 turned it into a comment (if you're <10k you can't see the deleted answer, but it was the same as the comment), which the OP then said "hey, that's the answer, can you please submit an answer so I can upvote it".

To my mind, while the answer given perhaps wasn't phrased "quite right", and could have been longer on detail, the fix, if anything, was to edit the question to change it from an interrogative to declarative sentence. But I don't feel that an answer-in-the-form-of-a-question is by definition invalid -- it's just another form of a statement, that in many cases can be quite effective in making a lesson "stick" (I believe it's called the Socratic method).

I'd previously flagged the deleted answer (9 minutes after it was posted, and 5 minutes after it was deleted), saying "this is a valid answer. It should not have been turned into a comment". Given that the answer-cum-comment was, effectively, the accepted answer, I'm wondering what the rationale actually was for deleting the answer (instead of, at most, editing it into the form of an answer), and hence for rejecting my flag.

This also brings up another (related) point, which I'll explore in a separate question if people think it's a big deal -- if I flag a mod operation (as in this case), is the same mod able to respond to the flag, and if so do they? It smells a bit odd if they do (but I don't know if that's the case, because there's no attribution on flag results).

The second one is an OP's answer that... well, isn't. The really interesting bit here is that I really think this "answer" should have been turned into a comment -- the "answer" given by the OP is basically "I fixed it", with no useful description for other people who find the question to actually solve the problem. I'm firmly of the opinion that this isn't a valid answer.

So, where have my thought processes gone wrong on these two flags?