We can't boil every injury down to one single blow. 

What hurts us is cumulative. It happens over time. We absorb blow after blow, shock after shock, painful hit after hit. 

But even then, even if we know exactly how we got here, it doesn't mean we can fix it.

 You can't heal every wound and that's okay. 

 even if something seems like it cannot be fixed, it doesn't mean it's broken.