Someone with a red had and red and white mittens standing in the snow overlooking a lake.
A person throws snowballs at another person.
That someone is standing in the snow, you don't have to be throwing snowballs.
exists e1 e3 e2 s1 s2 x1 x2 x3 x4 x5 x6.(n_snow(x5) & Theme(e3,x3) & Actor(e3,x1) & v_have(e3) & for(e1,e2) & Theme(e2,x6) & Actor(e2,x4) & v_overlook(e2) & n_lake(x6) & in(e1,x5) & Actor(e1,x4) & v_stand(e1) & (x3 = x4) & n_mitten(x3) & a_white(s2) & Theme(s2,x3) & a_red(s1) & Theme(s1,x3) & with(x1,x2) & n_red(x2) & n_person(x1))
exists e1 x1 x2 x3.(at(e1,x3) & n_person(x3) & -(x3 = x1) & n_person(x1) & n_person(x1) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_snowball(x2))