On a track, an athlete prepares to launch a javelin.
An athlete throws the javelin as part of the decathalon  competition.
Just because he is launching a javelin does not mean he is in a decathalon competition.
exists e1 p1 x1 x2.(on(e1,x2) & n_track(x2) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_launch(e2) & n_javelin(x3)) & n_athlete(x1))
exists e1 x1 x2 x3 x4 x5.(n_competition(x4) & of(x4,x5) & n_decathalon(x5) & n_javelin(x2) & as(e1,x3) & of(x3,x4) & n_part(x3) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_athlete(x1))