Mickey Munoz fish tail.

Adam from the US sent me these pics of an amazingly rare 7'1" 1975 Gerry Lopez Lighting Bolt single fin shaped by Mickey Munoz with this incredible fish tail. The stringer is signed Munoz and dated 75 and has a serial number 8932. I wonder what the theory was behind this design. It's unlike the crew a Bolt to push a concept that didn't work. I don't know how this tail was meant to turn as I imagine it would create a lot of drag when you dug the rail in to make a bottom turn and I'm guessing the guys in the glassing bay didn't much like it either.