The flight instructor reported that, while observing the solo student pilot's flight from the ground, the approach looked good, but the airplane might have been fast. As the airplane flared, he noticed the right wing "kind of pop up" just before touch down. Subsequently, the airplane landed sideways and exited the left side of the runway.

The instructor added that, the student was unsure of what happened, but reported that he had just lost control.

The airplane sustained substantial damage to the left wing and fuselage.

The flight instructor reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.