Terms used in § 22-49-5 mean:
(1) "Cruel," brutal, inhuman, sadistic, or that which torments;
(2) "Serious mental injury," a condition that results in a substantial alteration of mental functioning that is manifested in a visibly demonstrable manner caused by or resulting from:
(a) The intentional infliction or threatened infliction of serious bodily injury;
(b) The administration or application, or threatened administration or application, of mind-altering substances or other procedures calculated to disrupt the senses or the personality; or
(c) The threat of imminent death.