I appreciate that the logic used to identify serial downvotes is kept private and generally I could care less about my rep (considering it is funny-money afterall and I care even less on meta sites where it is even funnier-money) but I am curious. I've recently been a "victim" of what appears to be serial downvoting based on my response to this meta question (yes I realize that 2 downvotes generally probably aren't enough to trip the sensor) but it seems awfully coincidental that I leave a couple comments that could be seen as negative on a question and suddenly I receive 2 downvotes within seconds of each other.
Without exposing too much about the serial downvote sensor's inner-workings, would someone be able to help me justify this for my own peace of mind?
I understand that it is possible that 2 different people could downvote me at the same time (though not likely considering my limited number of questions and that they downvoted 2 questions that were generally upvoted).
Is it common practice to see serial downvoting on MSO as one would expect to see on SO?