Just the thought of two guys bunched around a small thing like a crossbow would look funny.
If I use my hands to decock I grab with both hands and pull with the same energy to cock it. At that time you can use your thumb or index finger to trip the trigger. The only issue I would have with someone handling the string (other than how it looks) is that if the other person isn't carefull the metal finger that holds down the arrow when the xbow is cocked may get damaged. Can you use a rope cocker on your bow? If you can it will enhance your accuracy.