Bill D wrote..........
If the glider has transitioned into a spiral dive, and the pilot does
nothing or uses spin recovery controls, it's going to get nasty -
especially at low altitudes.

I believe the way to distinguish between a spin or a spiral is to take
a quick peek at the airspeed indicator. If it is reading 60 knots or
more, you are in a spiral, not a spin and need to roll the wings level
and pull the nose up to the horizon. If you apply spin recovery
controls (stick forward and opposite rudder) you will find yourself
going straight down right now!
Cheers,
JJ