My assessment. The plane has two throttle controls. The student on the left flaired too high, pulled back after a gust dropped off, starting a stall, and the instructor added power to arrest the firm landing. Instructor took over the controls from that point. The student makes no attempt to fly except to manipulate the controls after the instructor takes over. Instructor never changes the pitch attitude after adding full power, keeping the plane slow and mushy at the controls. He also doesn't add sufficient right rudder and the left turning tendencies turn the plane to the left. Why he didn't pitch slightly down and add right rudder to correct this problem, I have no idea. Why he continued at a 30 degree heading off the runway, I have no idea. Maybe he was scared to bank right at such a low speed. I can guarantee he reduced power because he knew there were trees somewhere ahead and in the back of his head he wanted to stop. That's what you would do in a car and it's negative learning. He couldn't see over the cowling and panicked, just wanting to stop the plane right where it was, and reduced power. When he saw the trees he snapped out of it and went into, "I need to climb!" mode. I don't think he would've been able to out-climb the trees at that point anyways but he put in the power and pulled back more, which jumped him above the trees for a moment, but ran out of the airspeed and stalled. The reason for the left roll was a power on stall in a slight left bank when the stall occurred. Almost every left turning tendency was working against him at that point as well. Had it been higher the plane probably would've done at least one turn in a spin.
