I was practising in 12 knots and getting all the way around to waterstart position, well a couple of times.
But I could never take the board with me. Figured sub planing it is pretty much stuck underwater.
At just planing speeds, full of confidence from you sub-planing skills, you size up a ramp and then.... too scary.

I must say it takes a bit of guts to go for your first one.
As said above it is really a flat spin, sideways. Not a forward
roll.