A man holding a camera underwater.
A man swimming.
Just because the man is holding his camera underwater does not mean he is swimming.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_hold(e1) & n_underwater(x3) & of(x3,x4) & n_camera(x4) & (x1 = x2) & n_man(x1))
exists x1 x2.(a_topic(x1) & n_swimming(x1) & of(x1,x2) & n_man(x2))