Surprised they didn't slip on the water under their feet. Or if it was adhered, that the water under their feet didn't slip on the water further under their feet. And so on. Truly a godlike power, that manages to additionally increase the viscosity of the liquid in the entire pool to such a degree that they can stand solidly on it, while keeping it a liquid such that they can sink/float depending on bouyancy + retain it's ability to propagate ripples and waves.