This is just fishtails done with both hands, held together in prayer underneath. I normally cross my thumbs over my hands so I can grip my hands together to keep them in prayer. (They seem to have a habit of coming apart to try and make the move easier.)
I then show putting propellers into the fishtail on both sides. This is my favourite bit of prayer fishtails. You have to get your hands very off center for it to work however. Somehow two hands are harder to control than one...
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