The man is welding the iron.
Someone is welding in the picture.
A man is someone, if he is welding the iron he is welding.
exists e1 x1 x2.(n_iron(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_weld(e1))
exists e1 x1 x2.(n_picture(x2) & in(e1,x2) & Actor(e1,x1) & v_weld(e1) & n_person(x1))