A skier catches air over the snow.
The skier is standing at the top of a slope.
A skier cannot catch air while just standing at the top.
exists e1 x1 x2 x3.(n_snow(x3) & over(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_air(x2) & n_skier(x1))
exists e1 x1 x2 x3.(n_top(x2) & n_skier(x1) & at(e1,x2) & of(x2,x3) & n_slope(x3) & Actor(e1,x1) & v_stand(e1))