And assuming that man does not have velcro footwear, the mere fact that only the force or gravity acting through his feet against the wall via the rotational moment of the woman's head is enabling him to climb the tower, that same force must be strong enough to scalp the woman. And what woman in her right mind would risk having her scalp torn off when a (rotational) moment's thought would have brought her to the conclusion that the safest way would be to anchor her hair round something solid. I can only assume the said sucking of teeth of Mr Certain Person was indicative of the paradoxically impossible situation presented to him in the cartoon.