It was said plain as day up there a little bit earlier - chair fly! When I have a student like this I ground them if I can so I don't waste a sortie. Then we sit in front of the poster or in a cockpit simulator and we go over the demo/do. Then I have them take me throught the maneuver until they have it or are getting close. I've found it builds a great deal of confidence back to the student once they get in the moving aircraft again.