A man who is extreme biking down a trail.
A boy who is running cross country.
A man biking down a trail cannot be running cross country at the same time.
exists e1 p1 x1 x2.(a_topic(x1) & exists e2 s1 x3.(a_down(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,x2) & v_bike(e2) & n_trail(x3)) & Topic(e1,p1) & Actor(e1,x2) & v_extreme(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_run(e1) & n_country(x3) & of(x3,x4) & n_cross(x4) & (x1 = x2) & n_boy(x1))