What is happening with that glider?
the engine is damaged
it is releasing the water ballast
cabin decompression is ongoing
contrails are formed due to low air temperature
The extra weight provided by the water ballast is advantageous if the lift is likely to be strong, and may also be used to adjust the glider's center of mass. To avoid undue stress on the airframe, gliders must jettison any water ballast before landing.
reach: rather globalaviationgliderstechnology