Thanks for the explaination. I did know what you were talking about. Actually if you look in the pic I posted, you can see the CFI explain that exact principle. I didn't know the term for what it was called. Thanks.Pilot Induced Oscillation or PIO
I am sure others can explain it better than I can but.....
Basically it is the pilot over compensating on the controls. And each compensation is more than the last. It is my understaning that more than 2 or 3 of these of these in a row can result in loss of control, bunt over, and or rotors contacting the rudder in flight.