A marching band with dancers performing on a football field
The band and dance team perform at half time.
Just because a marching band with dancers performs on field does not mean it is half time.
exists e2 e1 x1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x2) & on(e2,x4) & n_field(x4) & of(x4,x5) & n_football(x5) & Actor(e2,x3) & v_perform(e2) & (x2 = x3) & n_dancer(x2) & n_band(x1) & Actor(e1,x1) & v_march(e1))
exists e1 x1 x2 x3 x4 x5.(n_team(x3) & of(x3,x4) & n_dance(x4) & n_band(x2) & subset_of(x3,x1) & subset_of(x2,x1) & at(e1,x5) & n_time(x5) & Actor(e1,x1) & v_perform(e1))