I was in the middle of writing an answer to this question when it was held for being a duplicate. (This meta is not about the duplicate status, just that it was and still is held as of this meta.)
Once the question was held, the SE interface refused to let me post the answer I was already composing. Yet several minutes after the question was held somebody else's answer appeared. I've checked the time stamps: that answer appeared about 20 minutes after the question was held.
I'm curious why/how this happened. I understand that sometimes the site is permissive/flexible regarding in-progress content (like editing a comment after the time limit has passed), but why was I forbidden to post an answer within seconds after the question was held even though another user was allowed to post an answer many minutes later?