premise: A large group of people walking down a city street.
hypothesis: a man sits
explanation_1: A large group refers to more than one man, and everybody in that group is walking, not sititng.
explanation_2: A man is one person not a large group.   Sits requires not moving.  Walking requires movement.
explanation_3: A single man is not a group, and one cannot be simultaneously walking and sitting.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & a_down(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & n_street(x4) & of(x4,x5) & n_city(x5) & (x2 = x3) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 x1.(Actor(e1,x1) & v_sit(e1) & n_man(x1))