A BMX rider airborne on his bike
Someone does parkour in the city.
One cannot be airborne on his bike and does parkour simultaneously.
exists x1 x2 x3 x4.(a_topic(x1) & on(x1,x4) & n_bike(x4) & of(x4,x1) & n_male(x1) & n_airborne(x1) & of(x1,x3) & n_rider(x3) & (x1 = x2) & ne_org_bmx(x2))
exists e1 x1 x2 x3.(n_city(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_parkour(x2) & n_person(x1))