Just hoof a hole with your heel and nip off into it then hoof the spoil back over to cover. I always include the paper with the poo. In really remote areas it’s OK just to lift a fallen rock behind a wall then replace it.
Best “field” experience was when I was a joint leader on a Brathay group doing a 2 week walk through Knoydart. We lived on Raven freeze dried ration packs, which we carried or picked up at loch and road heads. On the first morning various members of the group disappeared behind the bothy with the entrenching tool and came back looking puzzled. When my turn came I was amazed to see that halfway along, my poo suddenly turned from a healthy pale brown to bright dayglow green! For the rest of the two weeks we were all reporting dayglo green!
My worst WC experience: I was at Karachi domestic airport waiting for a flight when I suddenly realised I needed to go. The terminal was a brand new building in beautiful marble and in the gents was a young Pakistani lad, shuffling around with a mop looking very proud of his job. As usual somebody had been standing on the seat (why?) so I just dropped my kegs, bent over avoiding the seat and let rip an evil stream of hot spicy brown sauce. I thought it was funny that I hadn’t heard anything pouring into the pan so I looked round and realised to my horror that the stream had shot out horizontally behind me, hit the wall and was already spreading like spilled brown paint all over the pan, down the wall and out across the floor. Now I knew how the French always managed to make such a mess in campsite squatters. I cleaned it up as best I could using the ablution hose but had no choice but to leave most of it, sitting gently suppurating like a nuclear meltdown and oozing across the spotless marble floor. I washed my hands and was on my way out of the door when the young lad opened the trap to have a mop around and saw the mess; his jaw dropped and he went pale with shock. I could only smile apologetically, make a “sorry” gesture and make off as fast as possible. Poor bloke.