denis travels to mt. washington, where he has manipulated rogi using metapsychic coercion to journey to the summit. bad weather hits the mountain and rogi is shepherded into a shack by his nephew. denis persuades rogi to kill him with his yogic technique, as he fears fury will regain control. none of his children could manage that even though they have strong metapsychic powers, because children seem to have a block against using their powers to attack their parents. and as denis regards rogi as a father figure, he hopes that fury cannot use his powers against rogi. rogi feebly manages to start the technique but cannot muster the power. however, fury does regain control and tries to kill rogi physically, since the mental block against using metapsychic powers against parent figures does indeed apply. this act of violence gives rogi the necessary desperation to trigger his operancy, and he vaporises denis, to his great grief.