Didn't there use to be a grace period of 5 minutes after a question was closed where answers could still be submitted, but where one can't start writing an answer? If there wasn't (and I have just dreamed that the feature existed), shouldn't there be?
I was almost done writing a medium-long answer to Why is there no Nobel Prize in math when I got a notification that the question had been closed and I couldn't submit it. This was, according to the site, only 2 minutes after the closure.
(It is not my intention to discuss whether this question should have been closed. I thought it was a reasonable enough question that we should provide an answer. But that was before the asker added boldface lines to his question with subjective arguments that there should have been a Nobel in math).