[quote=@Witch Cat]
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Is there anything as a blood substitute? Does animal blood make him gag? Is it the thought that the blood came from a living thing that disturbs him? Does he slave away in his lab trying to make artificial blood to end his guilt?
[/quote]

No blood substitutes yet, animal blood doesn't satiate the craving but makes him gag, he hates blood due to his experiences in WWI and No Mans Land, and he tries to make artificial blood. Got it?