A group of four children pose on a muddy beach, smiling and making faces.
A man stirs the stew.
He refers to a group of four children not a single man. They cannot be posing on a muddy beach and stirring stew simultaneously.
One man is not four children, and you do not stir stew on the beach.
A group of children is not the same as one man. Posing on a beach is not the same as stirring a stew.