Paragliding crash, accidentally stalling on fast beat

Описание: Flying from Worcestershire Beacon in a SSE wind, which is not the right wind direction for this hill, which prefers an East wind. The time of day was about 12:15. Small punchy thermals rolling across the hill. I took off and glided along the hill on the slow beat. I hit a thermal and got some good lift. I turned back on the fast beat and wrongly tried to get close to the hill, like would work if the wind was straight onto the hill. I flew out of the back of the thermal and was forced to land hard when I hadn't expected to [ I now believe I had slowed too much and stalled close to the ground, assuming I had more air speed because of my downwind ground speed ]. I absorbed the impact well with bent legs and followed through into a face plant. I was unhurt. My phone had come out of its holder. Probably some more scuff marks on my harness, but it looked ok. I fixed my phone back on. I checked my reserve handle was still in place, then flew to Church Stretton.