[NeilB]

As has been said lots of factors come into this question.
How well do you know the person - family or friend?
How close is support - boat and recompression chamber?
How much deco do you need to do - safety stop or big deco?
How deep is your deco - 3m, 6m or deeper?

These and lots more will affect what you will do on the day. If you knew your boat crew were competant you could make the casualty bouyant and send him to the surface while you stayed and did your time. However, would you fix your reel to them and let it out as they ascend to make sure they stayed at the surface, or just watch them go up and hope they stayed there?
Or do you ignore the stops and take the casualty to the surface knowing that a helicopter can be there in 5 mins for you both and you have lots of oxygen on board?
All depends on the day.......