HAL9000
Lifer
He should still understand the scenario.
Some chav pulls a knife --> you can knock his teeth out with a baseball bat or any other object available
There is a difference between someone coming up to me with a knife and trying to mug me, to which I respond with beating them up with a baseball bat. And someone showing me a gun from another car, to which I respond with executing them.
Equate it to a friend showing me a knife and I knock their teeth out with a baseball bat.