Frosted Porridge and Gunshots

I am just uploading this picture of Porridge at dawn in a crunchy field of frost, (don't ask me why it is blue, the camera has its own opinion about colour), and I can hear loud gunshots close to my window... in my garden?
There is only a faint glow of light left in the sky, so I can't imagine how they are aiming their guns at the game when it is dark. Perhaps they have infra red sights on the guns. I had better not walk too near the window in case they are heat seeking missiles. If you don't hear from me again, they got me...