Opposing players challenge each other in a game of ultimate frisbee.
The people are watching a football game on TV.
Watching is different than challenge.
exists e1 x1.(all x2.(n_other(x2) -> exists e2 s1 x3 x4.(in(e2,x3) & of(x3,x4) & n_frisbee(x4) & a_ultimate(s1) & Theme(s1,x4) & n_game(x3) & Theme(e2,x2) & Actor(e2,x1) & v_challenge(e2))) & n_player(x1) & Actor(e1,x1) & v_oppose(e1))
exists e1 x1 x2 x3 x4.(n_people(x1) & on(e1,x4) & n_tv(x4) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_game(x2) & of(x2,x3) & n_football(x3))