Running water is destined to slow down, to become heavy.
And then, after seeing the reflections, the dreamer suddenly looks at the water itself.
The water will get darker. And in order to do so, it will absorb shadows in a material fashion.
Water is no longer a substance that is drunk; it is a substance that drinks. It swallows the shadow like a black syrup.
It is not difficult to recognize this water as blood.