In 2013 I provided an answer to a question I liked quite a lot. In my answer I mostly referred to the technique mentioned in the question but in the end I made a side remark indicating that there are other ways to achieve the same result. This answer has been upvoted since then. Recently, Saad Malik found an error in the second part of my answer and he posted a follow-up question showing the flaw.
I asked him some time until I properly reply to his question (since I'm currently on holidays currently writing this message from my tablet over a phone line). And here comes my first observation: catching mistakes and making them apparent to the community is one of the best things of stackexchange and, of course, science over all. I do want to acknowledge properly his contribution.
Of course, the first would be to provide a good answer to his follow-up question. But what else can I do? Any advice would be very welcome.
For instance, I of course upvoted his question and I also upvoted his comment to my first answer but I'd really like to give him more than 10 points. Is there a way to do that?
I'm also kind of surprised to see that noone else upvoted his question. Am I wrong if I say that we should encourage the community to be very favourable to this kind of questions? (note that Saad Malik has been always both very gentle and right, this is not the case of someone posting rubish, much the opposite, the question is very well written)
Also, while discussing broadly how to approach best these kind of questions, I was happily surprised that noone is providing a reply. I understood this as an indication that it is me who should do it (as I will certainly do). So another kind of recommendation would be for the community to allow first to the guy committing the mistake to provide a better and more detailed answer.
So far, the question is quite general. What should be the best practices both for the community and a specific user to approach questions that show flaws in other answers? (I think we should even have kind of a badge for this which I would happily award him :) )