So 26 seconds in we have a drunken walk and butterfly palm sequence. In the video the practitioner uses two different mechanics - a spiral (neither expanding or contracting) for reversing the hands then a liner expanding circle mechanic for the push. In this case the spiral would be a dragon mechanic and the push a cranes wing mechanic. The practitioner could have chosen to drive the push from a spiralling expansion in which case it would be a dragon mechanic for both the reversing the hands and the push. in fact this movement is suited to the dragon application as spiralling the hands loads the dynamic tension into the tantien ready to be released in the push.