two people are looking off a cliff.
Two people have thrown an alien off the cliff.
You cannot be looking off the cliff if you are throwing something off the cliff.
exists e1 x1 x2.(off(e1,x2) & n_cliff(x2) & Actor(e1,x1) & v_look(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_cliff(x3) & off(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_alien(x2) & n_people(x1) & card_eq_2(x1))