There is a skier getting some air on the slopes.
A robot is skiing.
A skier usually refers to a human who skis, not a robot who skis.
exists p1 x1 x5.(n_slope(x5) & exists e1 x2 x3 x4.((x1 = x2) & on(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_get(e1) & n_air(x4) & (x2 = x3) & n_skier(x2)))
exists p1 x1.(exists x2.((x1 = x2) & n_skiing(x2)) & n_robot(x1))