sentence: Several people are on horses playing polo. sentence:   There is a crowd in the background watching. sentence:   A careless man causes his horse to fall. sentence:  The horse gets up but, the man remains on the ground. sentence:  The other players and a referee ride their horses away. sentence:  One of the players and a woman walk over to check on the man on the ground. sentence:  The other polo players are in the area walking around with their horses. sentence:  An ambulance arrives and drives on the field.