A flock of people walking down an ancient street.
A bunch of people walk down the street.
A bunch of people is the same as a flock of people; a group. If they are walking down they walk down the street.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & a_down(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & n_street(x4) & a_ancient(s1) & Theme(s1,x4) & (x2 = x3) & n_people(x2) & n_flock(x1))
exists e1 x1 x2 x3.(n_street(x3) & down(e1,x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_people(x2) & n_bunch(x1))