What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The pilot was practicing soaring out away from the airport in midafternoon when conditions changed from reasonably good lift to flat thermal activity to sink. He determined he would not be able to return to the airport from his location, so he selected a field oriented into the wind, of more than sufficient length, and overgrown with grass with few weeds, as this indicates a low probability of large rocks or ruts.
When he touched down, he discovered the grass was much higher and thicker than he expected. The high drag of the grass and rapid deceleration loads on the bonding line on the wing causes the composite bond line to give the appearance of a failure from overload in a short section near the left wing root.
As the FAA filed it
THE PILOT WAS PRACTICING SOARING OUT AWAY FROM THE AIRPORT IN MIDAFTERNOON WHEN CONDITIONS CHANGED FROM REASONABLY GOOD LIFT TO FLAT THERMAL ACTIVITY TO SINK. HE DETERMINED HE WOULD NOT BE ABLE TO RETURN TO THE AIRPORT FROM HIS LOCATION, SO HE SELECTED A FIELD ORIENTED INTO THE WIND, OF MORE THAN SUFFICIENT LENGTH, AND OVERGROWN WITH GRASS WITH FEW WEEDS, AS THIS INDICATES A LOW PROBABILITY OF LARGE ROCKS OR RUTS.
WHEN HE TOUCHED DOWN, HE DISCOVERED THE GRASS WAS MUCH HIGHER AND THICKER THAN HE EXPECTED. THE HIGH DRAG OF THE GRASS AND RAPID DECELERATION LOADS ON THE BONDING LINE ON THE WING CAUSES THE COMPOSITE BOND LINE TO GIVE THE APPEARANCE OF A FAILURE FROM OVERLOAD IN A SHORT SECTION NEAR THE LEFT WING ROOT.