A Red Man is not like the Native American but a man who becomes Vajra empowered to fill a task that is beyond the current persons capabilities.
In the development stage, Vajra empowerment is the last practice and in the fulfillment stage, the third practice.
The color is red as in discriminating wisdom. complete, the complete mandala in the center of center less space.
How is this so?
When you meditate, your body is your space but your aspiration is to have all the enlightened within and outside.