A man on a snowboard travels downhill towards the camera.
A man is snowboarding.
Being on a snowboard implies he is snowboarding.
exists e1 p1 x1 x2 x3.(n_camera(x3) & towards(e1,x3) & exists s1.(Theme(s1,x1) & a_downhill(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_travel(e1) & on(x1,x2) & n_snowboard(x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_snowboard(e1) & n_man(x1))