I was once hit between the eyes and did not know my nose was broken until the xray was taken, and while it hurt when it happened, it hurt more the next day when everything started to swell.
And about 24 hrs after it happened, the usual black eye appeared....
I would imagine if you went thru a windshield or got hit by a 2x4 it would be worse looking much sooner.
And like I said yesterday, when someone is banging your one and only brain against concrete-AND the BACK of your skull which is more sensitive, there are only 2 outcomes:
Maiming or death...that’s it.
It is a MUST that you defend yourself because it is life threatening; smashing the head is not like breaking an arm-and I think that’s one reason they will lose.
I’ve told the story before of a brother of a friend. Guy grabbed his arm, he swung around, fellow lost balance, fell hit his head on bridge abutment, died. Brother did time for manslaughter.