You can definitely identify some risk from a punch before the fact. If the puncher is a 15-year old girl, you are not at risk of maiming or death. If the puncher is a kickboxer, your argument gets much better and deadly force may be justified.
The trial takes all contextual arguments into account. Was it soft grass or asphalt, was the ground slippery, did you know that people can die after falling backwards on a curb, etc. A punch is not ipso facto "ordinary force."
You can definitely identify some risk from a punch before the fact. If the puncher is a 15-year old girl, you are not at risk of maiming or death. If the puncher is a kickboxer, your argument gets much better and deadly force may be justified.
The trial takes all contextual arguments into account. Was it soft grass or asphalt, was the ground slippery, did you know that people can die after falling backwards on a curb, etc. A punch is not ipso facto "ordinary force."