The snowboarder is sitting down.
A snowboarder takes a break between runs.
Just because he is sitting, doesn't mean he is taking a break. We also have no way of knowing if he has done any runs at all.
exists e1 s1 x1.(n_snowboarder(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & between(x2,x3) & n_run(x3) & n_break(x2) & n_snowboarder(x1))