If your friend fell off a ladder and hurt his/her back in a way that prevented them from moving, what would you do? The chances are that you don't know how to assess that injury. It's prudent for you to call 911 and have an EMT and/or Paramedic assess and make the call on the next action.
It's different if you are a doctor, working at a factory, and have an injured employee brought to your infirmary.
If your friend fell off a ladder and hurt his/her back in a way that prevented them from moving, what would you do? The chances are that you don't know how to assess that injury. It's prudent for you to call 911 and have an EMT and/or Paramedic assess and make the call on the next action.
It's different if you are a doctor, working at a factory, and have an injured employee brought to your infirmary.