While one man, in the white cap, is golfing, three other men are in the middle of a conversation.
A man putts while his group talks to each other.
While a man is golfing when  three other men are conversing , it does not necessarily mean that the man playing also belongs to the group of three men.
People can talk without necessarily being a part of his group.
The man who is golfing while the other 3 men talk, may not be about to putts [sic].