Fourth stage is to fly. But along the ground by doing somersaults. This way, one can move quicker and further.
14 seconds sound clip from the Shaolin Chastity Kung Fu movie soundboard.
You can hear this line at 00:39:44.825 in the DVD version of the movie.
Quote context
[...]
- This will turn your muscles really hard.
- But this does mean that you can sustain more punishment without it causing you serious injury.
- Hey, come on, quit, no, no, no, you're hurting me, hey. Hey, hey, no, no, no, let me go. Come on!
- Each of your blows must be strong, and keep your arms close in to your body.
- Catching claws are mainly for attack. It has two stages. The first stage is barehanded.
- Catch! Withdraw. These are the basics.
- Catch quickly! Tight withdrawal.
[...]