Oh... how cute! Silas has his normal expression on if most characters attack him, but if Corrin attacks him the pre-battle analysis shows him with a sad face!

In the actual fight, dialogue. "I became a knight in the hope of seeing you again, but..." That's adorable. Anyway, he's one of a lot of people who want to take her back to Nohr like it or not, but we wipe the floor with him.