The mountain biker in blue rides down a rocky path.
A mountain biker is competing in a downhill race.
Just because the mountain biker is riding down a path doesn't mean he's competing in a race.
exists s1 s2 x1 x2 x3 x4.(n_biker(x1) & of(x1,x2) & n_mountain(x2) & a_topic(x1) & in(x1,x3) & down(x3,x4) & n_path(x4) & a_rocky(s2) & Theme(s2,x4) & n_ride(x3) & a_blue(s1) & Theme(s1,x3))
exists e1 x1 x2 x3 x4.(in(e1,x3) & n_race(x3) & of(x3,x4) & n_downhill(x4) & Actor(e1,x1) & v_compete(e1) & n_biker(x1) & of(x1,x2) & n_mountain(x2))