Two young boys are playing in the water.
two boys have a splash fight
There are many games the boys could be playing, so you cannot infer they are playing a splash fight.
exists e1 s1 x1 x2.(n_water(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fight(x2) & of(x2,x3) & n_splash(x3) & n_boy(x1) & card_eq_2(x1))