Two young people engage in a friendly snowball fight.
Two people throwing snowballs from behind snow covered cars.
People may not be the young people mentioned in the sentence. Two young people may not be throwing from behind snow covered cars.
exists e1 s1 s2 x1 x2 x3.(in(e1,x2) & n_fight(x2) & of(x2,x3) & n_snowball(x3) & a_friendly(s2) & Theme(s2,x2) & Actor(e1,x1) & v_engage(e1) & n_people(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 e2 x1 x2 x3 x4 x5.(Theme(e2,x5) & Actor(e2,x1) & v_cover(e2) & n_car(x5) & behind(e1,x4) & n_snow(x4) & r_from(e1) & Theme(e1,x3) & Actor(e1,x2) & v_throw(e1) & n_snowball(x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))