The main logical flaw in the reflection theory is that if it was actually causing the lighting under the clouds, and the shadow of the mountain, the shadow cast would appear close to the mountain. As time goes by and the sun moves further from the mountain, the shadow would get farther from the peak. The exact opposite occurs. The sun casts the mountain's shadow to the ground and as the sun sets the shadow rises and eventually as the sun gets low enough is cast upward to the clouds. That shadow then gets closer and closer to the peak as the sun sets beyond the horizon.