A dirt biker who is sideways in the air having come off of a dirt jump.
The biker is riding
Not all people doing tricks are riding.
exists p1 s1 x1 x2 x3 x4.(n_air(x4) & a_topic(x1) & a_sideways(s1) & Manner(p1,s1) & exists e1 x5 x6 x7.(in(x3,x4) & of(e1,x6) & n_jump(x6) & of(x6,x7) & n_dirt(x7) & r_off(e1) & Actor(e1,x5) & v_come(e1) & (x4 = x5)) & (x1 = x3) & n_biker(x1) & of(x1,x2) & n_dirt(x2))
exists e1 x1.(n_biker(x1) & Actor(e1,x1) & v_ride(e1))