Two men fighting at an MMA event.
George and Bill were fighting.
Just because two men are fighting does not mean that there names are George and Bill.
exists e1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x3) & n_event(x3) & (x3 = x4) & ne_org_mma(x4) & Actor(e1,x2) & v_fight(e1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(ne_per_bill(x3) & ne_per_george(x2) & Actor(e1,x1) & v_fight(e1) & subset_of(x3,x1) & subset_of(x2,x1))