Actually, person on bottom had face facing upwards and would have more light on it. In limited light, the person on top would be facing down and have his face in less light.
Two equal complexions would appear as stated.
Just saying.
The witness also said the person on the bottom had red on his coat and the man on top had on all black.
Zimmerman’s coat had red on it.
That would be a relevant observation in a confrontation between people with equal complexions, which this case was not.