A bike rider is doing performance tricks.
A biker is performing on his bike.
A bike rider is doing performance tricks does not indicate that he is performing on his bike.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_trick(x3) & of(x3,x4) & n_performance(x4) & n_rider(x1) & of(x1,x2) & n_bike(x2))
exists e1 x1 x2.(on(e1,x2) & n_bike(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_perform(e1) & n_biker(x1))