Great harm is not the same as grave harm. Which is why I didn't use it. The harm that someone does can be great regardless of the intent.
If someone punches you, kicks you, slams you, as hard as they can then they are trying to do great harm to you. The question of "did it actually harm you" is a different thing. But what remains consistent is there effort and intention to hurt you with their full force. Grave harm is not defined as this which is.
I don't think anyone here has said that "every physical altercation is a life and death situation." I've know some assumptions have been made about kung fu wang said. But the fact that you "Keeping it in the back of your mind" pretty much validates what I think Wangs Teacher was saying.
If a person gets into an argument then, then understand that the argument can turn into a fight.
If a person gets into an fight then understand that the fight can turn into a life and death situation.
If a fight turns into a life and death situation then understand that it could be due to someone pulling a weapon out on you.
If someone pulls a weapon on you then you may be in a situation where you need to "draw blood."
If you do not "draw blood" then you may die. If you do "draw blood" then you may die. If you are not willing to take things to this level then try to end it before it gets to this level.
We never know what the other guy is going to try to do to us are how they will try to harm us. We also don't know if the great harm is going to come as a fight or if that harm is going to skip the physical fight and turn into a shooting.
Something to think about.