Two basketball players oppose each other at the net.
The players are on opposing teams.
Nowhere is it implied that the players are on teams of any sort.
exists x1 x2 x4.(n_net(x4) & all x3.(n_other(x3) -> exists e1.(at(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_oppose(e1))) & n_player(x1) & of(x1,x2) & n_basketball(x2) & card_eq_2(x1))
exists p1 x1.(n_player(x1) & exists e1 x2 x3.(on(x1,e1) & Theme(e1,x3) & Actor(e1,x2) & v_oppose(e1) & n_team(x3)))