After posing, the middle finger and thumb squeeze each other. Imagine that an ant is crushed to death in the middle, and then the thumb slides to the right, and the middle finger will be pressed down.
It will become like this.
The principle is that the thumb suddenly slips off, causing the middle finger to press down quickly, hitting the meat below the tiger's mouth and making it crunchy.
The position of the red circle on the way is the contact point.
It's the same as whistling Practice a few more times and you will master the skills.