The musher is pressing the dogs to the finish line.
A man is riding his dog team to the finish line.
A man riding a dog team would be a musher.
exists e1 x1 x2 x3 x4.(n_line(x3) & of(x3,x4) & n_finish(x4) & n_dog(x2) & n_musher(x1) & to(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_press(e1))
exists e1 x1 x2 x3 x4 x5.(n_line(x4) & of(x4,x5) & n_finish(x5) & to(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_team(x2) & of(x2,x3) & n_dog(x3) & of(x2,x1) & n_male(x1) & n_man(x1))