A person is hanging in the air from the power lines.
A person is performing an act from his place on the power lines.
Because a person is hanging from a power lines doesn't mean the person is performing an act.
exists e1 x1 x2 x3 x4.(n_line(x3) & of(x3,x4) & n_power(x4) & n_air(x2) & in(e1,x2) & from(x2,x3) & Actor(e1,x1) & v_hang(e1) & n_person(x1))
exists e1 x1 x2 x3 x4 x5.(n_line(x4) & of(x4,x5) & n_power(x5) & on(e1,x4) & from(e1,x3) & n_place(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_act(x2) & n_person(x1))