So what you are saying is he threw a strike that was intended to connect ?
That strike has then hit his opponent finishing him ?
That sounds like a pretty good strike to me whether it hits his chin, liver or leg.
Just as a heads up some people no longer throw strikes aimed at the chin directly in stand up.
I know mma fighters, with ko wins, who throw all punches to the chest and get the knockout from the opponent slipping into the punch.
This can also happen with headkicks aimed at the shoulders.