Sam cutting off Gordon’s head with a wire was gruesome to watch and I shortly wondered if that’s believable, but I think I remember faintly from the Mr. Ripley novels that it is entirely possible to sever a head with a piano cord, with an extreme rush of adrenaline it shouldn’t necessarily require extra-human strength to achieve that. On the other hand, Sam was fighting for his' and Dean's life, fuelled by Gordon's attack on Dean and since I assume that Sam may still have his powers, it would theoretically be able for him to subconsciously unlock Jake-like super-strength in a rush of anger and desperation, like he did with the telekinesis incident in Nightmare.

I never knew that; but that's interesting to know. I had heard something along the same lines, but not completely.

As for the entire episode? I definitely agree with you; it ranked up there. ^^ ♥!