Is it legit for an answerer to roll back an edit made by the original author of a question?
Here's a link to the question that led to me asking about rollback etiquette.
Here's the timeline of edits.
Here's the timeline of events on that question.
Author posts a question about feasibility of physically killing Vorlons who are part energy beings. The question additionally mentions a poisoning attempt made on a Vorlon.
Somebody posts an answer that is only about poisoning the Vorlon.
I pointed out to the author that part about poisoning is already answered elsewhere and suggest removing that part of the question to avoid it being flagged as a duplicate.
Original author accepts my suggestion and removes the extra part.
I post a comment to person that posted the answer letting them know it is now obsolete. The intent was to give the answerer a chance to update the answer so it won't be downvoted.
Answerer rolls back an edit made by the original author so that the answer is again relevant to the question.
This does not seem okay to me. The author knows his or her intent, so the author's edits should be considered more important than somebody else's edits just to bring the question in line with their answer.
Related request: Can a mod freeze the comments on that question so nobody deletes or flags them?