A skier climbs up a snowy trail toward his poles.
There is a skier flying down the slopes.
The skier cannot be both climbing up and flying down the same mountain.
exists e1 s1 s2 x1 x2 x3.(toward(e1,x3) & n_pole(x3) & of(x3,x1) & n_male(x1) & a_up(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_trail(x2) & a_snowy(s1) & Theme(s1,x2) & n_skier(x1))
exists p1 x1 x4.(n_slope(x4) & exists e1 x2 x3.((x1 = x2) & down(e1,x4) & Actor(e1,x3) & v_fly(e1) & (x2 = x3) & n_skier(x2)))