A person riding their bicycle up a dirt mound while two other people are in the background watching.
he is about to perform a trick
the fact that people are watching a person ride a bike does not imply that he is going to do a trick.
exists e1 p1 x1 x2 x3 x4 x5 x7 x8 x9.(n_watching(x8) & of(x8,x9) & n_background(x9) & n_people(x7) & a_topic(x1) & exists p2 x6.(in(x6,x8) & -(x6 = x7) & n_people(x6) & card_eq_2(x6)) & while(e1,p1) & up(e1,x4) & n_mound(x4) & of(x4,x5) & n_dirt(x5) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bicycle(x3) & of(x3,x1) & n_thing(x1) & (x1 = x2) & n_person(x1))
exists p1 s1 x1.(n_male(x1) & Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2)))