The Zone

Getting shot or stabbed is inevitable. What matters is how you deal with it.

If you are reduced to 0 health via gunfire, or 0 hit points via melee, you will be on the floor dying. No distinction is drawn between the two for healing purposes.

If you are on the floor due to melee damage your gun will still be operational.
You should not use your firearm whilst on 0 hit points

Any character with the first aid skill can treat their own injuries at any point after they are put down. They can still take no further action until the combat is over. Once the combat is concluded, any character that is still standing can now treat the injuries of anyone else that hasn't already done so for themselves.
Once everyone is treated (or left to die…) a game referee will come round and re-activate everyone's guns. At this point you are back to full health and full hit points. Everyone that had an injury treated should remain where they are until the referee re-activates their gun. At this point the referee will hand them a Wound Card.