This is a lethal combination to set up a power body shot.
You need to throw some high power combination before this to get you opponent to shell up in a high guard, then the tap to the head takes their attention away from the body and causes the arms to lift
This opens the body to a power shot which hurt so much it can easily stop the fight
![](https://i.ytimg.com/vi/9eeLq5wxjo0/maxresdefault.jpg)