I hurt my back the other day and I'm suffering through it. It's just a muscle pain, nothing to do with my spine, but it reminds me of a story about Dad when he was a cop.
Somehow Dad had gotten into one of those apartment building airlocks with a bad guy. You know the places, where there is one outside door and another door a few feet away. The outside-outside door doesn't get locked, but the inside-outside door is the one that has to be buzzed open from someone in an apartment.
I guess this bad guy was REALLY big and bad. Dad figured he had to hit him fast and hard. His only chance to get him was to hit first as hard as he possibly could. So he did. Dad hit him and he backed up against the door.
He growled and lunged forward, bent over like he was going to tackle Dad so Dad hit him in the side of the face.
He shook it off, raised his hands with a growl and charged. He was still bent over so Dad hit him again, as hard as he possibly could.
He shook it off with another growl, raised his hands and went after Dad again, still bent over. Amazed that he hadn't knocked the guy out, and afraid that if he let him stand up straight he would pound Dad into a pulp; Dad hit him again as hard as he could.
Finally the guy managed to talk. Dad found out that they bad guy had been shot previously and the bullet had lodged near his spine. When Dad backed him against the door he had pressed his back against the door knob and the bullet had been pushed so that it was pinching his spine. He couldn't straighten up or raise his hands above his chest because of it.
All those times he shook off the hit was a growl, what he was trying to say was, "Please stop, I give up," and raise his hands in surrender.