A shirtless man with a backpack.
The man carries his own backpack.
A man does not have to be shirtless.  Just because a man has a backpack it does not mean it is his own or that he carries it.
exists s1 x1 x2.(a_topic(x1) & with(x1,x2) & n_backpack(x2) & n_man(x1) & a_shirtless(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_backpack(x2) & a_own(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_carry(e1))