The flash starts out the same as a 540 flat spin, except that the initial dive is not vertical, but down and out towards the left side of the window at about 45 degrees. Pancake the kite when the kite is at about a foot off the ground. The kite should remain "tilted" 45 degrees. Now popping the right hand will initiate a rotation of the kite AND a movement towards the center of the wind window. Pull the kite out of it's rotation after 1 1/2 turn. Instead of popping the kite you can also pop while pancaking by stopping your popping arm earlier than the other one and extending the other one. It might be easier to keep the kite rotating when walking forward keeping the rotating wing hand extended.