Zack finds none of this distasteful. When water is scarce, blood has the added advantage of nutrients. When he kills a rat or a snake, nothing is wasted.

He doesn't know it yet, but Zack can't get drunk from mortal alcohol. He's made of the dust of dead worlds, supernaturally enhanced. He may feel pain and hunger, but poisons don't harm him too much, even if they do taste unpleasant and induce a sore belly. When Abdiron created him, he didn't want his new little brother dying on him.

“Addle away,” he pushes his glass towards Iago for a refill.

As the human seems so lordly and polished, Zack decides that his official title might present him in a good light. He's not showing off, or trying to intimidate; only show that he's worth speaking to. Some of Dean's tutelage on how to behave is actually sinking in. Try to relate to them a little, ask polite questions to show you're interested.

He's still getting the hang of 'polite' but Zack is trying hard.

“I'm Aisaak, prince of the hell dimension of Antillioch; Avenger of murdered worlds; brother to the hellgod Abdiron. He's my first most noble and valiant lord... Is your general a great man?”