A man with a shaved head riding a mountain bike.
A man is in a bike race.
Just because the man is riding a mountain bike doesn't necessarily mean he is in a bike race.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & of(x4,x5) & n_mountain(x5) & (x1 = x3) & with(x1,x2) & n_head(x2) & a_shaved(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1.(exists x2 x3.(in(x1,x2) & n_race(x2) & of(x2,x3) & n_bike(x3)) & n_man(x1))