The aircraft owner, who held a commercial pilot certificate, was seated in the right seat, and a private pilot was in the left seat, for an instructional/transition flight in the amateur built experimental airplane. The aircraft owner reported that they were landing when the private pilot reduced engine power on short final and the aircraft's nose dropped. The owner said the private pilot pulled the stick back "too aggressively" and then moved it rapidly forward and the airplane subsequently contacted the runway "quite hard." In response, the private pilot increased power and initiated a go-around. As the power increased the airplane's nose pitched up and the private pilot "shoved" the stick forward. The airplane contacted the runway in a 30-40 degree nose down attitude. After contacting the runway, the airplane's nose and right main gear collapsed, which resulted in structural damage to the wing assembly and forward fuselage. No preaccident mechanical anomalies with the airplane were reported.