Because the person in shock will choke on the food or drink
Only allow to drink water
on their back in a laying position
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Pain and shock.
allow the victim to assume the position easiest for breathing, and observe/treat for shock.
Possibility of shock.
So the electric currents from the AED do not transfer from the victim to yourself, thus, you yourself becoming a victim of shock if exposed to the currents.
The person touching the victim will also receive an electric shock (not as powerful as the victim but a shock none the less).
Insure there is no pulse before you attach the pads to the victim.
If you touch the victim while an AED is delivering a shock, you too will receive a shock.
You should not move the victim except as necessary. The person should not be given anything to eat or drink. You should watch for signs of shock and locate a proper medical facility as quickly as possible. Loss of fluids can be treated by IV where available.
So no other person but the victim gets the shock.