Not exactly a good picture to compare but we see where the lighting is coming from because of all the shadows. It's coming from the front of the crowd.
I guess the lighting would have to come from the area where the person taking the picture is standing. That perhaps explains this lighting but what about this one?
No idea where the lighting is coming from in the front?
Where was this?
Which pictures were take in sunlight and which after dark ?
Are they the same rally?