A man in a red shirt is throwing a frisbee while another man wearing a white t-shirt is trying to stop him from making the throw.
an ultimate frisbee tournament is underway
The fact that a man is throwing a frisbee while another man is trying to stop him from making the throw doesn't imply that an ultimate frisbee tournament is underway.
exists e1 p1 s1 x1 x2 x3 x8.(n_throw(x8) & exists e3 e2 p2 s2 x4 x5 x6.(Topic(e3,p2) & Actor(e3,x4) & v_try(e3) & exists e5 e4 x7.(from(e4,e5) & Theme(e5,x8) & Actor(e5,x7) & v_make(e5) & Theme(e4,x1) & Actor(e4,x4) & v_stop(e4)) & Theme(e2,x6) & Actor(e2,x5) & v_wear(e2) & n_t-shirt(x6) & a_white(s2) & Theme(s2,x6) & (x4 = x5) & n_man(x4) & -(x4 = x1)) & n_male(x1) & n_man(x1) & n_man(x1) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_throw(e1) & n_frisbee(x3) & in(x1,x2) & n_shirt(x2) & a_red(s1) & Theme(s1,x2))
exists s1 s2 x1 x2.(Theme(s2,x1) & a_underway(s2) & n_tournament(x1) & of(x1,x2) & n_frisbee(x2) & a_ultimate(s1) & Theme(s1,x1))