Germany 's Stephan Feck attempted a somersault .
Germany 's Stephan Feck lost the grip on one leg which saw him spin out of control and land flat on the water flat on his back with a huge thud .
Germany 's Stephan Feck attempted a somersault , but lost the grip on one leg which saw him spin out of control and land flat on the water flat on his back with a huge thud .