

So, dead?
In some contexts, yes. However you’ll still likely have to defend charges of manslaughter. You’d have to demonstrate that the actions you took could reasonable be expected to not result in the death of the subject; and that those actions were necessary to prevent receiving grievous bodily injury or death.
and would have the capacity to simply “calm down” once the threat has been stopped.
Lots of people defend themselves without turning their unconscious assailants into pin cushions. You seem to be fundamentally misunderstanding how reasonable force is determined. I suggest you read my other comments.
they don’t know if the threat is over,
If you can remove yourself from the situation the threat is over. It’s factually wrong to suggest that people can’t tell when they’ve won a fight.
or if someone else is going to bust in to kill them,
Continuing to inflict damage on an incapacitated assailant logically does nothing to prevent another potential unknown assailant from attacking you.
or if the original attacker will fight back, or if they have a weapon, etc.
Those factors will determine what level of force is reasonable. Unreasonable force generally comes into play after the assailant has been incapacitated.
Courts should be very lenient
You should be thankful you have right to defend yourself at all. Not all countries grant that to their citizens. The logical limitation of that right is that defending yourself does not permit you to “counter-assault” others.
Assault in Canada doesn’t require them to hit you first. It includes threats with the ability to follow through. So you may preemptively strike to end an altercation without being charged for assault. HOWEVER, the average male is 28,000% less effective in combat than they think they are. So it’s generally a poor option for untrained individuals… as shit gets out of hand. Pre-emptively striking to end the fight early only works if you can actully do that.
Yea because around the time McCafe rolled out in Canada Tim Hortons switched to roasting their coffee inhouse while McDonalds had their supplier create a similar blend to the old tim hortons coffee.