You know how it is brother, the media will have a freaking field day if you don’t render first aid.
That is, after you put the drop gun, or in this case drop rock in juniors hand. /s
To the non-peace officer types, you are in NO WAY required to administer first aid to anyone shot while invading your home. Keep them covered from a good covered and concealed position while talking on the phone to the dispatcher. The phone line is recorded, make sure you say you were in fear for your life, and if you need to warn the suspect not to move, say to stay still or you will take their movement as a continued threat.
Try to stay on the line until the officers arrive, give a complete physical description of your self, the suspect, and your location to avoid misunderstanding or surprises. Establish an early verbal dialogue with the arriving officers, but say nothing incriminating, only that your weapon is secured, you hands are in plain site, etc.
Remember, every successful defensive shooting will be treated as homicide, which is not the same as murder but the investigation will be thorough and intense.
One CCW article I read said to get in the car (and take everybody else in the house) and move a block away, while telling the operator what you are doing. That way the cops CAN'T mistake you for the Bad Guy.