A crowd of people at some kind of protest.
One person sitting down.
Crowd implies multiple people and not just one person.
exists x1 x2 x3 x4.(a_topic(x1) & at(x1,x3) & of(x3,x4) & n_protest(x4) & n_kind(x3) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 s1 x1 x2.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_person(x1) & card_eq_1(x1))