Athletes running in a race.
Humans running at night.
Athletes running doesn't particularly imply at night.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_race(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_athlete(x1))
exists e1 x1 x2.(ne_nam_humans(x1) & at(e1,x2) & n_night(x2) & Actor(e1,x1) & v_run(e1))