During AED shock, why can't we touch the casualty?

AED Precautions

• Do Not touch the victim while defibrillating. You or someone else could get shocked.
• Do Not use alcohol to wipe the victim's chest dry. Alcohol is flammable.
• Do Not use an AED in a moving vehicle. Movement may affect the analysis.
• Do Not use an AED on a victim who is in contact with water. Move victims away from puddles of water or swimming pools or out of the rain before defibrillating. (See above answer to the question "Can AEDs be used safely in the rain and snow?")
• Do Not use an AED on a victim lying on a conductive surface. Conductive surfaces, such as sheet metal or metal bleachers, may transfer the shock to others.
• Do Not use an AED on a child under age 8 or under 90 pounds. AEDs do not have the capability to adjust to the low-energy settings needed for infants and children. Local protocols may differ on this and should be followed.
• Do Not use an AED on a victim who has a nitroglycerine or other patch. Remove any patches from the chest before attaching the device.
• Do Not touch the vicitm while the AED is analyzing. Touching or moving the victim may affect the analysis.
• Do Not defibrillate someone around flammable materials, such as gasoline or freeflowing oxygen.
• Do Not use a cellular phone or radio within 6 feet of the AED. This may interrupt analysis.

Credit : http://ehs.missouri.edu/work/aed.html