What happens next?

The man in purple practices returns from a squash cannon serving machine. the man in the grey and white shirt

Pick your answer from: (I) returns from a ball cup and tries again.. (II) take out hands a nocks and began stretching his legs.. (III) enters the enclosed squash court picks up some of the balls and proceeds to load the squash cannon serving machines.. (IV) practice on a wall using the m-16..
(III)