Stuart Casserley's Brother

What caused the site where his brother died to glow? Was it Stuart's brother's spirit?

"My older brother committed suicide two weeks before Christmas 2014. Four weeks to the day I visited the spot with my wife. Whilst there, I heard my brother tell me to do a photo which my wife took of me. This is the image that came out. I then took three further photos in relative succession and all came out as normal pictures. I believe my brother's presence is around me all the time!"