Despite the short distance, Brain advanced carefully and took his time reaching the door. Climb was on standby at the bottom of the stairs. He did so to avoid being dragged into any accidents should they occur.
Brain first poked the door with his sword. After repeating this several times, he grabbed the doorknob— and twisted it. His movements then stopped.
As he worried over what might have happened, Brain turned to him and spoke with a plaintive voice.
“…It’s locked.”
Of course. A door would be locked.
“Ah, I have something. One moment.”
He rang the last of the three handbells at the door.
With the power of ‘Bell of Open Lock’, the faint sound of a key unlocking the door could be heard.