People with numbers on their chests are running in a pack.
A man runs alone through a field.
People in a pack is plural while a man who runs alone is singular.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_pack(x4) & Actor(e1,x1) & v_run(e1) & on(x1,x3) & n_chest(x3) & of(x3,x1) & n_thing(x1) & with(x1,x2) & n_number(x2) & n_people(x1))
exists e1 s1 x1 x2.(through(e1,x2) & n_field(x2) & a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_run(e1) & n_man(x1))