People going down a hill on a roller coaster
Men are on a ride.
You cannot tell that men are on a roller coaster in sentence 1 because it is just talking about people in general. People is a gender-neutral term.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_go(e1) & on(x3,x4) & n_coaster(x4) & of(x4,x5) & n_roller(x5) & n_hill(x3) & (x1 = x2) & n_people(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_ride(x2)) & n_man(x1))