"Ah—yes, of course." He digs the card out of his pocket (he will never get used to this thing, or the sneaking suspicion that one day it will simply stop working) and taps it to her device, delivering the payment as promised.

He checks the cages to make sure that the water bottles have been topped up and steps out into the hall again. He goes to the storage room with the Dutch door and unlocks the top and bottom halves. There's still some random odds and ends of furniture piled up in this one, but needs must and all.

"Here—you can release the crab into this room, and I will shut the door behind it."