To decapitate someone by ‘stabbing’ you would need a wide knife.
What an awful story. I would imagine it would be fairly difficult to decapitate someone, I mean, you would have to go thru the spine. Maybe it’s not that hard, but it seems like it would be. At least with a knife.
I saw a close-up video of a jihadi decapitation a few years ago. I want to tell you, I was sick for awhile.