He smiles back and is about to respond-then the birb chirps loudly, startling him
"Eep! Dang it Chip-"
He glares at the bird on his shoulder, then it chirps again and his eyes widen
"Wait-what!? W-Why didn't you tell me that sooner!?"
He follows Chip through the twists and turns of the castle until they reach they library. He runs in and reaches a mousetrap in a corner of the library. There's a small, brown and white spotted mouse huddled in a ball in the back of the trap, clearly terrified. Darien bends down, getting on it's level, and talks to it in low, soothing tones
"Oh no...hey-hey it's ok...you're safe, I promise...I'm gonna get you out of there..."
(Mans just actively preventing mouse cruelty-)