A player swings at a ball.
A baseball player swings at the pitch.
A player is not necessarily a baseball player.  A player swinging at a ball is not necessarily swinging at the pitch.
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_ball(x3) & n_swing(x1) & of(x1,x2) & n_player(x2))
exists x1 x2 x3 x4.(n_pitch(x4) & a_topic(x1) & at(x1,x4) & n_swing(x1) & of(x1,x3) & n_player(x3) & of(x1,x2) & n_baseball(x2))