On Friday, July 20, 2018 at 6:30:07 PM UTC-5, Jock Proudfoot wrote:
National Transportation Safety Board
Aviation Accident Preliminary Report

The glider was equipped with a FLARM electronic flight collision
alerting device, which records flight track, altitude, and airspeed.
About 11 seconds prior to impact with the ground, the glider entered a
left hand descending spiral at an airspeed of 48 knots, which continued
to ground impact.

https://app.ntsb.gov/pdfgenerator/Re...atorFile.ashx?
EventID=20180710X25659&AKey=1&RType=HTML&IType=FA
.

Doesn't really sound like a stall/spin from low altitude. Sounds more like the behavior of a glider trimmed for an off-field landing with no one at the controls.