A baseball player (not the pitcher) is winding up to throw the ball to another player.
The shortstop is throwing to first base.
Throwing to first base is throwing the ball to another player.
exists x1 x2 x3 x4.(n_ball(x4) & n_pitcher(x3) & -exists e1 p1 s1.(a_up(s1) & Manner(e1,s1) & Topic(e1,p1) & Actor(e1,x1) & v_wind(e1) & exists e2 x5.(to(e2,x5) & n_player(x5) & -(x5 = x1) & Theme(e2,x4) & Actor(e2,x1) & v_throw(e2)) & rel(x1,x3)) & n_player(x1) & n_player(x1) & of(x1,x2) & n_baseball(x2))
exists e1 s1 x1 x2.(n_shortstop(x1) & to(e1,x2) & n_base(x2) & a_first(s1) & Theme(s1,x2) & Actor(e1,x1) & v_throw(e1))