As an insult, it’d have been a ploy to make you look weak. Justify Carmilla taking the city in your father’s absence.

[ They already knew that part. Aside from the detail about Carmilla it was obvious sine the start. But now there’s a different way this could have gone. Probably one that she would have preferred. ]

If he thought it was true- likely he meant to use you to kill Dracula and have Carmilla use that as justification for killing you while you were weakened and taking the city for herself that way.

God, I almost got the two of you into deep shit. Sorry, and all that.