A boy is surrounded by pigeons.
The boy is scared.
Just because a boy is surrounded by pigeons does not mean that he is scared.
exists e1 x1 x2.(Actor(e1,x2) & n_pigeon(x2) & Theme(e1,x1) & v_surround(e1) & n_boy(x1))
exists e1 x1.(n_boy(x1) & Theme(e1,x1) & v_scare(e1))