About the incident - bicycle

Can I say,

On a quater past four, Sam and Peter went for their volleyball practice. They cycled hurriedly because they were late. Their volleyball practice were starting at four-twenty.

While they rode Peter lost control of his bicycle and crashed into the sand. Sam felt shocked when he saw his friend injured. Peter hurt both his legs.

Sam carried Peter on his back. He ran to the a clinic nearby. The doctor treated both of Peter's legs.