Honestly decapitation is more humane than a broken neck. The drop in BP is enough to cause immediate lights out, where as someone with a broken neck could very well have to suffocate to death inside their own bodies.

The blood pressure drop has a huge effect on cognition.

I think they mean the guy slit the birds neck, severing the arteries but not the spinal cord, and then let it drain, instead of fully beheading it.

Yeah, I think decapitation is fine. I think this guy just cut their carotid, and hung them up to die.

Not a great way to go, honestly.

I'm familiar with some butchering methods, but I'm no butcher. I think that the most common practices in large butcher shops involve either decapitation, or a way of instantly killing the animal. Pretty sure they use a type of bolt "gun" for bovines that basically crushes their skull.

It seems like it is brutal, but their death is so instant, it is considered to be humane.