Bicycle rider wearing black, riding down a dirt trail in a mountain bike.
They are in a race
the bicycle rider doesn't have to be in a race to wear black or riding down a dirt trail.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(in(e2,x7) & n_bike(x7) & of(x7,x8) & n_mountain(x8) & a_down(s1) & Manner(e2,s1) & Theme(e2,x5) & Actor(e2,x3) & v_ride(e2) & n_trail(x5) & of(x5,x6) & n_dirt(x6) & n_rider(x3) & (x3 = x4) & ne_nam_bicycle(x4) & exists s2.(Theme(s2,x1) & a_black(s2)) & Topic(e1,p1) & Actor(e1,x1) & v_wear(e1) & n_rider(x1) & (x1 = x2) & ne_nam_bicycle(x2))
exists p1 x1.(n_thing(x1) & exists x2.(in(x1,x2) & n_race(x2)))