Two people chasing butterflies and catching them.
The butterflies are active.
Both sentence are talking about a butterflies.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & Theme(e2,x1) & Actor(e2,x4) & v_catch(e2) & n_thing(x1) & (x1 = x4) & Theme(e1,x3) & Actor(e1,x2) & v_chase(e1) & n_butterfly(x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists s1 x1.(n_butterfly(x1) & Theme(s1,x1) & a_active(s1))