Anchor: A person in a green jacket and yellow pants is on a snowboard coming down a roof into the snow.
Entailed: A person riding a flat object is moving from a high place to a lower place.
Contradiction: A person injured his hamstring, and could not ride to the mountain today.
Contradiction: A girl is sledding down a hill.
Contradiction: A person doesn't know how to snowboard.
Contradiction: A person is on a snowboard and eating a mutton sandwich with shoes as bread.
Contradiction: A person falling in the snow