This question already has an answer here:
Yesterday, there was a comment in: Spiteful downvoting? Two fast DVs to my unrelated posts
Comment has been deleted and I would like to understand what could be wrong with it?
Per my recollection, comment text was about as follows:
Vote reversal script won't catch this. My theory is, some users aware of how script works, do this to indicate dislike of something you did. This happened to me more than once and frankly, I sometimes do that myself. By the way, suggested dupe is wrong: this is not the case addressed in the answer to What is serial voting and how does it affect me?