There is a man pitching a baseball and has a glove his left hand.
a man is is throwing a ball
A man throwing a ball with a glove in his left hand pretty much says he's a pitcher.
exists e1 p1 s1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x2) & v_have(e1) & Time(x4,x5) & n_a(x5) & Time(x4,x3) & n_glove(x3) & n_hand(x4) & a_left(s1) & Theme(s1,x4) & of(x4,x3) & n_male(x3) & exists e2 x6 x7 x8.((x1 = x6) & Theme(e2,x8) & Actor(e2,x7) & v_pitch(e2) & n_baseball(x8) & (x6 = x7) & n_man(x6)))
exists e2 e1 x1 x2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_throw(e2) & n_ball(x3) & Actor(e1,x2) & v_be(e1) & (x1 = x2) & n_man(x1))