GVC wrote: Yes it's reflecting but what reflects with black around it?
Acutally in bright light lots of glares (and other things we may not notice) will show up on an IR camera as black because the camera is rendering in black and white at that point.
The reflections to the left which do not move are also outlined in black. Since they didn't move they weren't examined as closely.
I am guessing that a light source was moved or blocked while this was being taped.