A large crowd swarming a guy.
a person gets surrounded by a group
A crowd swarming a guy implies that the person is getting surrounded by people.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_swarm(e1) & n_guy(x3) & (x1 = x2) & n_crowd(x1) & a_large(s1) & Theme(s1,x1))
exists e1 p1 x1.(exists e2 x2.(Actor(e2,x2) & n_group(x2) & Theme(e2,x1) & v_surround(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_person(x1))