Kids building and destroying objects.
Kids are playing with live grenades.
The kids can't be playing with live grenades and building things at the same time.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_destroy(e2) & n_object(x4) & n_kid(x3) & Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_object(x2) & n_kid(x1))
exists e1 s1 x1 x2.(with(e1,x2) & n_grenade(x2) & a_live(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))