A man in a red jacket and sunglasses is snowboarding down a snowy mountain.
A guy is racing down a mountain
The sentence does not refer to the speed at which the man travels, nor if he is competing with others, so he may not be racing but leisurely enjoying the slope.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(a_down(s3) & Manner(e1,s3) & Theme(e1,x5) & Actor(e1,x1) & v_snowboard(e1) & n_mountain(x5) & a_snowy(s2) & Theme(s2,x5) & in(x1,x2) & subset_of(x4,x2) & n_sunglass(x4) & subset_of(x3,x2) & n_jacket(x3) & a_red(s1) & Theme(s1,x3) & n_man(x1))
exists e1 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_race(e1) & n_mountain(x2) & n_guy(x1))