He slid halfway down the mountain before winding up in the netting .
Germany 's Stephan Keppler , the first racer of the day , had a bad spill , when he lost his balance and crashed .
Stephan Keppler slid halfway down the mountain before winding up in the netting .
Germany 's Stephan Keppler , the first racer of the day , had a bad spill , when he lost his balance and crashed .