Two people hiking on a trail.
Two people are walking fast.
They are hiking, not necessarily walking fast.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_trail(x3) & Actor(e1,x2) & v_hike(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 s1 x1.(a_fast(s1) & Manner(e1,s1) & Actor(e1,x1) & v_walk(e1) & n_people(x1) & card_eq_2(x1))