Man on a motorcycle performing a trick in the air.
The man on the motorcycle is part of the circus.
Just because the man is performing tricks doesn't mean he is part of the circus.
exists e1 x1 x2 x3 x4 x5.(n_air(x5) & a_topic(x1) & on(x1,x2) & in(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_perform(e1) & n_trick(x4) & (x2 = x3) & n_motorcycle(x2) & n_man(x1))
exists p1 x1 x2 x4.(n_circus(x4) & n_motorcycle(x2) & n_man(x1) & exists x3.((x1 = x3) & of(x3,x4) & n_part(x3)) & on(x1,x2))