Blue John Cavern Ghost Picture

Kerry Hopper sent us this picture from a cavern. Is this a ghost around them, or was it called by cold breath? You decide...

"My partner and I went to the Blue John Cavern in Castleton, Derbyshire, UK. I tried to take a photo of the stairs leading back to the top of the cavern. The cavern was very clear; no smoke and it was lit with small lights on the walls. While leaving the cavern, I looked at the photo and the picture seems to show a man and a boy holding something spooky!"