Just guessing ... First stab was a blitz he didn't see coming and also was a debilitating blow like slashing a major artery or vein or puncturing an organ which left him unable to fight back.

When you get blitzed, the stun of it causes a 7 second delay in response. When you see an attack coming, it's 3 seconds. This was studied years ago and of course, applies to people without fight training. That's actually one of the things you train against.

The real reason women tend to do so poorly against attacks from males is that they are blitzed and stunned because they are typically not trained to fight.

But you can kill somebody in 3 seconds easy, if you know what you're doing. Where and how to strike and to blitz them.