Blurry Portrait

I wanted to shoot a nice portrait of our guide. He was so nice and we had a fantastic horse ride through the mountains, but he was very shy in front of the camera. After asking him a few times, he finally agreed to make a portrait of him on his horse, and that wasn't easy to get from him as he didn't like to be photographied....
I was so happy to have this chance, so I wanted to shoot quickly to not loose his patience ... and totally forgot to set the right distance on my Holga and my horse moved at the very moment of the "click"... and the shot came out totally out of focus and blurry... :((( Worst shot ever...