“knifeman was an idiot”
If I am seeing it right ... it looks like the knife was a kitchen knife of some sort.
Not that a kitchen knife can’t be effective ... but I don’t think it would be the first choice of someone with skills.
A good blade guy is a real threat .... even from 20 feet away.
If I have a knife and a guy puts me in a choke hold his fore arm is going to be sliced and diced.