RE: What could I have done?
Here's a little trick I use on some cold, foggy mornings. I lay my scope and gun under my hand muff next to my belly. There's just enough warmth to help hold off any fogging. Be careful that you don't breathe on that back lens in the excitement of taking aim at that big buck. LOL
(I was raised in northern Ill and a foggy morning can really fog up a scope.)