A boy with a black shirt and white shorts on a bike is turning to look behind himself.
The boy falls off his bike.
The boy cannot be on a bike and falls off his bike at the same time
exists e1 p1 s1 s2 x1 x2 x3 x4 x5.(Topic(e1,p1) & Actor(e1,x1) & v_turn(e1) & exists e2.(behind(e2,x1) & Actor(e2,x1) & v_look(e2)) & n_male(x1) & with(x1,x2) & subset_of(x4,x2) & on(x4,x5) & n_bike(x5) & n_shorts(x4) & a_white(s2) & Theme(s2,x4) & subset_of(x3,x2) & n_shirt(x3) & a_black(s1) & Theme(s1,x3) & n_boy(x1))
exists e1 s1 x1 x2.(n_bike(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_fall(e1))