This is the first time the Crown Prince does that, which makes him curious.
When he got the telepathic message, he was in Watertown, far away from the Royal District. He can't teleport over long distances. He needs to do it several times to get to the Crown Prince's secluded castle.
"My Lord, this is urgent! His Highness will explain it himself to you when you arrive…." Geoffrey can't say much, afraid of his Highness getting angrier if he says something he should not. His Highness was fuming enough with this incident that he didn't want to add to his anger.
"Alright, alright. Let's go, Geoffrey. If only the Crown Prince allows me to teleport myself onto his castle, we don't need to waste time crossing this lake..."
"My Lord, not only you who can't teleport but everyone, including the Emperor," Geoffrey said, slightly chuckling.