There's really no reason for a person learning to roll to swim if they practice in water about 2 1/2 ft deep so they can push off the bottom if they fail the roll or ... practice with others so you can use a bow rescue.
When I was learning and was hitting about 50%, I never swam.
Pull-Up Strap Handle Kit
PFD's (Life Jackets)
Rescue / Throw Bags
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