Taliesin

In the UK the principles are pretty much the same. You can use 'Reasonable force' against someone you have a genuine and reasonable belief they are going to attack you. You do not have to retreat in the face of such action (Not in the UK) and you are not expected to 'Judge to a Nicety' the amount of force used.

All these things are questions of fact which are unique to each specific incident.

For martial artists the argument may work as training in a Dojo is radically different to responding to an attack on the street . - But don't bet on it.

For people whose job is dealing with violence eg security or bouncers -forget it any argument about over-reacting won't wash.