The knock is answered by the clacking of claws on hardwood floors and a soft wuff from Lily. Lancelot can be heard gently shushing her, trying to edge her back from the door -- then he opens it and blinks out at Arthur. He looks tired, shadows under his eyes that aren't normally there and hair a little ruffled in a way that isn't just heat and humidity. He also looks faintly surprised to see Arthur.

"Hi," he says softly, adjusting his grip on Lily who wags at him. Hello, Arthur! Hello! She has seen you before. "Is something wrong?"

Maybe he needs help with something? Lancelot may have technically taken a day off but if something serious has happened he'd help nonetheless.