gpt
Subaru:  Subaru, having skipped out of the inn thanks to Rem’s kindness, ran downtown in the royal capital, his feet taking him to the Cadmon fruit store so he could contact Old Man Rom. “Sneaking into a castle…is not very realistic, is it? Well, nothing’s gonna happen unless I make it to the entrance of the royal palace…” It might have been possible to gain entry by explaining that he was connected to Emilia and Roswaal. But Subaru had few cards to play to even get that far.
human
Subaru:  “Even if I got to the garrison and explained, Emilia would probably turn down a magic mirror message…” If he could make it to the foot of the castle, he was confident he could verbally wear Emilia down. Emilia was weak under pressure. He didn’t think she’d chase Subaru off after he’d undergone a dangerous adventure to reach her.