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Sandee said..
Geez, I don't know where you got your scuba ticket but that teaching is just so WRONG! If you wait till someone loses consciousness at say 60 feet down, by the time you get them to the surface and commence resuscitation it's going to be way too late. You can easily and safely grab the stage 1 regulator on their tank from behind and pull them wherever you want, regardless of their level of consciousness or panic.
I know this as I was dragged unwillingly and rapidly to the surface when an o-ring blew emitting a stream of bubbles from my tank. My buddy apparently thought I wasn't understanding his signalling and was somehow oblivious to all the bubbles so took action despite my "OK" signalling. Nothing I could do but have a much faster ascent than I'd have chosen! (Fast ascents are dangerous in scuba diving).
If someone is flailing at-depth, they will grab the reg from your mouth, and push you away. They may pull your mask off. That leaves you to flail about looking for the occy which is now swimming behind/below you. Its why you are taught to give-them a reg - even the one out of your mouth.
At the surface people will clamber over you, pushing you below the surface. It is why amongst the many reasons, that you keep your reg in your mouth even at the surface (other reasons are waves, climbing the boat-ladder, rescuing someone).
In other words, you only approach someone to rescue, or to be rescued, if both parties are cognizant. In your example, your buddy clearly wasn't cognizant. ( That statement obviously doesn't apply to rescue-divers, as they have the training to handle it. ) I have also breathed the last of a tank at 17m - both my buddy and I were calm, then we made a safe non-stop ascent.
How that applies here to this discussion. If someone is wearing a leash, there are a couple of scenarios that are immediately obvious:
1/ safe separation of gear from person - but since the scenario that needed the leash (gear moving faster than person), then you are now being dragged through the water. This is bad news for you because you aren't able to cleanly surface to get a lung-full and thus regain your composure. If you have ever surfed/long-board/sup and be dragged, you will now what this feeling is like. But unlike being dragged by a wave, the wind will continually drag you.
2/ leash gets wrapped around the board. Most sailors have had a good scare when their harness gets tangled in the lines, while you are under the sail. Now a similar situation but with lines wrapped somehow which you have to determine, while being washed.
3/ leash gets wrapped around the person. This really doesn't even need a discussion... its all bad. If you have ever surfed with a leg-rope and had it wrap around say your foot, or your hand because you paddled over it, then something (wind/waves) moves the board, then you will know how tight the rope will get. Now consider that a windsurf board+rig is about x10 heavier and x10 surface-area, you are easily looking at x100 the tension in that torniquet.
In all of these scenarios, the sailor is putting themselves at undue risk. If you try to help them, in all likelyhood you will now also be at-risk.