The Water Bottle Wudhu

See you are not your amateur wudhu doer, you know the what and the hows! And the easiest way to do wudhu is to fill a water bottle, and silently make your wudhu in the washroom, and wash your feet in the garden outside. So you enter the washroom, and start filling your water bottle, as an old looking Arab person enters the room, what do you do?

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