Yes, Armand really can be terrifying. Why do you think Lestat’s so wary around him? This happens in later canon to remind you, tho:

“I had the heart and held it as I’d seen Pandora hold it. I drank from it. Oh, it had plenty of blood. This was magnificent. I sucked it to pulp and then let it fall” – TVA, Armand healing after going into the sun