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The Kraken:The technically advanced divers will clip off their primary regulator to the right shoulder d-ring when they're doing a decompression stop and using the regulator attached to a decompression stage bottle.
Keeps the reg from getting lost or entangled with other hoses.
The Kraken:I stand corrected!!
There is certainly a place for it in the recreational diving arena for this method, also. It's just that one normally associates this type of practice with decompression stops.
I should not "assume".