guy on his bike doing tricks
A girls is riding a scooter.
Guy and girls refer to different people, and the person is question is either riding a scooter or doing tricks on a bike
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_trick(x4) & (x2 = x3) & n_bike(x2) & of(x2,x1) & n_male(x1) & n_guy(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_scooter(x2) & n_girl(x1))