Never mind a solo student, I don't think in the heat of the moment i would have thought about putting the power up to give more flow over the rudder. Thats was with a cpl and ir pass under my belt.
But I wouldn't have gone anywhere near the attitude the instructor did and I wouldn't have waggled the controls the way he did either.
Chances of a solo student doing it in my opinion is nil. They won't have the balls to get the plane into the required attitude.
I haven't either since.