What happened when Maxwell took Mijbil to the bathroom? What did it do two days after that?

Maxwell made a body-belt for Mijbil and took him on a lead to bathroom. It went wild with joy in the water for half an hour, plunging and rolling in it, shooting up and down the length of the bathtub underwater, and making enough slosh and splash for a hippo.
Two days later, it escaped from his bedroom to the bathroom. By the time Maxwell got there, Mijbil was up on the end of the bathtub and fumbling at the chromium taps with its paws. Maxwell was left amazed. In less than a minute, it had turned the tap far enough to produce some water and after a moment, achieved the full flow.

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