This is right out of his book. Game over dude. It's time to face the fact that Crowley was extremely evil and sadistic. I suppose somebody made this all up and was able to put it in his book, just to frame him right?! I don't think so buddy
The animal should therefore be killed within the Circle, or the Triangle, as the case may be, so that its energy cannot escape. An animal should be selected whose nature accords with that of the ceremony — thus, by sacrificing a female lamb one would not obtain any appreciate quantity of the fierce energy useful to a Magician who was invoking Mars. In such a case a ram would be more suitable. And this ram should be virgin — the whole potential of its original total energy should not have been diminished in any way. For the highest spiritual working one must accordingly choose that victim which contains the greatest and purest force. A male child of perfect innocence and high intelligence is the most satisfactory and suitable victim. {95} For evocations it would be more convenient to place the blood of the victim in the Triangle — the idea being that the spirit might obtain from the blood this subtle but physical substance which was the quintessence of its life in such a manner as to enable it to take on a visible and tangible shape.
Those magicians who object to the use of blood have endeavored to replace it with incense. For such a purpose the incense of Abramelin may be burnt in large quantities. Dittany of Crete is also a valuable medium. Both these incenses are very catholic in their nature, and suitable for almost any materialization. But the bloody sacrifice, though more dangerous, is more efficacious; and for nearly all purposes human sacrifice is the best. The truly great Magician will be able to use his own blood, or possibly that of a disciple, and that without sacrificing the physical life irrevocably. An example of this sacrifice is given in Chapter 44 of Liber 333. This Mass may be recommended generally for daily practice.