Feng Shui: What's wrong with stepping on blood at night?

Under normal circumstances, if there is red liquid such as animal blood in the place where pedestrians pass, they will definitely be stepped on by passers-by, and everyone who steps on it is safe. Red characteristic blood bodies, including animal blood, pigment red and ghost blood, have different characteristics, which most people don't understand and can't explain clearly, so don't pay attention to them. Where there is ghost blood, there will be a dangerous bloody disaster near here in the near future!