Here are some inverted views; hopefully you will be able to see the light that is cast onto the cat better, as well as the cat's shadow.
This one is simply inverted:
This one is inverted and the brightness/contrast adjusted slightly:
I can definitely see the unknown light source shining on the cat's fur (which shows up as dark blue in the inverted pics). I also see a faint shadow behind the cat (toward the camera and shows a light-coloered in the inverts), which tells me - even though this was taken at night with no other light sources in the room (or outside, according to Mia) except the TV, that perhaps the ambient lighting in the room - possibly from the TV, has cast this faint shadow for the cat.
Another thing to note, Nakis, is Windows OS tends to display darker on a monitor, whereas Mac OS is a bit lighter. Maybe that's why you're having trouble seeing the light on the cat? Just thought it might be a possibility. =)
Kell