The mountain biker in blue rides down a rocky path.
A mountain biker in blue is in a race on a rocky path.
Just because the mountain biker is riding down a path doesn't mean that he's 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 p1 x1 x2 x3.(exists s1 x4 x5.(in(x1,x4) & on(x4,x5) & n_path(x5) & a_rocky(s1) & Theme(s1,x5) & n_race(x4)) & in(x1,x3) & n_blue(x3) & n_biker(x1) & of(x1,x2) & n_mountain(x2))