He holds his arms out with tight fists. Fists are about two feet apart, push downwards with my hands on the inside of his arms. This is a 'percussive strike as used in Bagwazhang in particular. It puts adverse Qi into the points. So at a physical level, the attacker does not know what his legs are doing etc.
Right palm begins upper near the neck while the left is lower near lower abdomen.
Both hands move simultaneously down and up respectively, then repeat this. So they end up in their beginning position. This must be done at fa-jing pace, the sound of the wind moving through the hands must be heard, it is that fast. You then separate the hands moving them down both sides of the face making a tear shape to end up with the last three fingers now touching at the point called CV 14 near the sternum. You should do this about three times until you 'feel' that his Qi is back to normal again.