Hmmm, do you mean a double-time spin, i.e. two revolutions in the space of one modern jive count (2 musical beats) -- rather than two consecutive single spins in the space of two modern jive counts (4 musical beats).
If you mean a double-time spin, nice to be able to do / lead / follow -- but not a necessity. [BTW: I really to do like these]
Consecutive single spins -- then, yes I think you should be able to lead/follow those.
However, what I think you should be able to do at some point after beginner classes, is to be able to to a single turn / spin in one modern jive count (2 musical beats) on the spot *and only then* step back, when led to do so. [I was amazed recently when chatting to one of the local teachers that she didn't actually know how to spin on the spot -- and had to keep "falling back" to finish the spin off and recover her balance]
It's quite hard as a leader to lead a turn on the spot, e.g. with Rr hands -- and then lead a Rr comb *on the next beat* without the follower stepping back, or trying to do another turn.
A lot of the single count turn moves seem to have lost their popularity (or have been slowed down) c.f. butterfly, corkscrew, swizzlestick, spring-lock. So I guess people aren't quite so used to leading / following them.
Neil.
P.S. Anyone know a good chiropractor in Hampshire/Berkshire
