A large flock of pigeons is swarming at a man.
A group of birds are moving toward a person.
A pigeon is a bird, so a flock of pigeons is the same as a group of birds.
exists e1 s1 x1 x2 x3.(at(e1,x3) & n_man(x3) & Actor(e1,x1) & v_swarm(e1) & of(x1,x2) & n_pigeon(x2) & n_flock(x1) & a_large(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(toward(e1,x3) & n_person(x3) & Actor(e1,x1) & v_move(e1) & of(x1,x2) & n_bird(x2) & n_group(x1))