"Not of nothing." It did not matter whether they were in St Louis, or nowhere, or on the moon. "Wherever I may be I am Master of my city, and a stronger Master than you."
Undisputed, even when Asher was at his full strength. Even when Asher was not injured and very probably still hungry. And that Jean-Claude had lashed out with his power at all, let his control slip enough for his voice to carry it, was a mark of how greatly Asher was affecting his emotion.