The mountain biker in blue rides down a rocky path.
A person rides their bike down a mountain trail.
A rocky path doesn't necessarily mean it's a mountain trail.
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.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & down(x2,x3) & n_trail(x3) & of(x3,x4) & n_mountain(x4) & n_bike(x2) & of(x2,x1) & n_thing(x1) & n_person(x1))