A baseball pitcher is about to throw the ball.
A pitcher is about to catch the ball.
A pitcher can't be about to throw the ball and also about to catch the ball at the same time.
exists p1 s1 x1 x2 x3.(n_ball(x3) & Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1.(Theme(e1,x3) & Actor(e1,x1) & v_throw(e1)) & n_pitcher(x1) & of(x1,x2) & n_baseball(x2))
exists p1 s1 x1 x2.(n_ball(x2) & Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1)) & n_pitcher(x1))