I think that is BS. In regards to tough meat.but I've read that the meat is better when they get their jugulars cut instead of lobbing off the full head. I do love the idea of a fast surefire method though.
I say this to everyone, if you don’t know what your doing don’t make the bird your learning curve.(in my opinion) If you can’t find someone to show you properly then just use axe and stump or cut/loop the head off.
Playing a guessing game while trying to kill something is just wrong.
Good luck