It's great that in your reply upthread you actually understood that it was a request for any kind of evidence, including evidence you just created on the spot, but now you pretend not to understand that.
What ever do you mean? There was no change in understanding. You spoke to seeking a proof in addition to a citation, the parent did not originally speak to the proof bit, only to a citation. Entirely different contexts.
In fact, you would have noticed, if you read it, that the "upstream" comment doesn't even touch on the citation at all. It is focused entirely on the proof aspect. While the parent wanted to talk about citations exclusively, at least at the onset. Very different things, very different topics.
