A sports player in a red shirt is falling to the ground with another sports player in a blue shirt stands behind him.
The players are rivals.
Just because the one player falls to the ground while the other stands behind him doesn't mean they are rivals.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_male(x4) & n_ground(x4) & with(e1,x6) & in(x6,x8) & behind(e2,x4) & Actor(e2,x9) & v_stand(e2) & (x8 = x9) & n_shirt(x8) & a_blue(s2) & Theme(s2,x8) & n_player(x6) & of(x6,x7) & n_sport(x7) & -(x6 = x1) & n_player(x1) & n_player(x1) & of(x1,x5) & n_sport(x5) & to(e1,x4) & Actor(e1,x1) & v_fall(e1) & in(x1,x3) & n_shirt(x3) & a_red(s1) & Theme(s1,x3) & of(x1,x2) & n_sport(x2))
exists p1 x1.(n_player(x1) & exists x2.((x1 = x2) & n_rival(x2)))