An airborne man on a surfboard.
A man mid air while his bike falls to the floor.
A man cannot be on both a surfboard and a bike at the same time.
exists s1 x1 x2.(a_topic(x1) & on(x1,x2) & n_surfboard(x2) & n_man(x1) & a_airborne(s1) & Theme(s1,x1))
exists p1 p2 p3 s1 x1 x2 x3 x4.(n_floor(x4) & for(p1,x1) & exists x5.n_event(x5) & exists e1.(to(e1,x4) & Actor(e1,x3) & v_fall(e1)) & n_bike(x3) & of(x3,x1) & n_male(x1) & while(p2,p3) & n_air(x1) & a_mid(s1) & Theme(s1,x1) & of(x1,x2) & n_man(x2))