I see it like this:
If we arguing, I'mma give you the respect as a human being to keep it at that level and as long as we keep it there we can yell, holler, and act a fool all we want but at some point we walk away. Prolly still talking shit, but we walk away and move on from it.
Once you violate me by getting physical in any way, shape, or form all bets are off. Fuck that. I gave you the respect you deserved by keeping it at just words, now you went and got physical so I'mma get physical right along with you.
Poke me in my chest or head and I'mma try to break that finger.
Mush me in the face and I'mm try to break your wrist or at least tear every ligament and tendon in your hand.
Push me and I'mma try to break your arm or arms if it was two handed.
Kick me and I'mm try to break that leg.
Punch me and I'mma try to break you.
A lesson must be learned and extreme pain is the only way to teach it.