A male wearing yellow pants catches air as he snowboards down an empty mountain.
The man is snowboarding.
A man that catches air down an empty mountain is snowboarding in general.
exists e1 p1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & exists e2 s2 s3 x6.(a_down(s3) & Manner(e2,s3) & Theme(e2,x6) & Actor(e2,x1) & v_snowboard(e2) & n_mountain(x6) & a_empty(s2) & Theme(s2,x6)) & n_male(x1) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_air(x3) & of(x3,x5) & n_catch(x5) & of(x3,x4) & n_pants(x4) & a_yellow(s1) & Theme(s1,x3) & (x1 = x2) & n_male(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_snowboard(e1))