A few people are walking through the snow to cross a bridge.
A group of people are covered in snow falling from the sky.
Just because they are walking through the snow, does not mean they are covered in it. Even though they are in snow, does not mean that the snow is falling from the sky at that time.
exists e1 p1 s1 s2 x1 x2 x3.(n_snow(x3) & Topic(e1,p1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x1) & v_cross(e2) & n_bridge(x4)) & through(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_people(x2) & a_few(s2) & Theme(s2,x2) & n_people(x1) & a_few(s1) & Theme(s1,x1))
exists e2 e1 x1 x2 x3 x4 x5.(n_sky(x5) & in(e1,x3) & from(e2,x5) & Actor(e2,x4) & v_fall(e2) & (x3 = x4) & n_snow(x3) & Theme(e1,x1) & v_cover(e1) & of(x1,x2) & n_people(x2) & n_group(x1))