Okay, I'm not a sick fuck but hear me out. I know a little bit of spanish, so I've been seeing this vid a couple of times. It's actually pretty interesting if you think about it.
We start the video with the main cutter just trying to put the dude out of his misery but they only have a boxcutter to cut his throat but they didn't learn that it's soft steel and it unsharpens really easily. So they are left with this moaning dude which they are trying to kill but they can't because the boxcutter is no longer sharp and they don't have any decent tools at hand to decapitate (like a hatchet, or saw or cleaver). And no dude steps on the mans chest to help end it when the main cutter asks for it. They are kinda like fumbling around and they seem pretty shaken by the screams and moans and just touching him with sticks. Not only that the wire used to lock the wrists are not holding to anything so he can still move. One dude timidly steps over an arm to stop the movement.
If I were an investigator I'd say this was an ad-hoc moment of brutality in a non-planned location and not a serial group of professional flayers, bolton-house style. And if I were to guess, they are also pretty horrified themselves at what they did at the end.