You may be right about multiple surprises. In boxing, knockouts usually come, not from a “hay maker”, but from the devastating effects of a combination of punches. As they say “punches in bunches”.
As an ex boxer, I can say you are 100 percent right.
The shots keep making your head hurt more and more and the headaches worse until that last one knocks you to the canvass for good.
Maybe saw two one punch knockouts out of 500 that I watched and the ones I was in.