this sounds a lot like the circle cast to me (I've also heard something like it called the "Coxon Kick" by Ed Jaworowski after UK caster and Sage rep Gary Coxon.)
also I've read a lot about concerns that spey casts disturb the water. While it is true that some of the casts disturb the water, this disturbance happens very near to the angler (who is disturbing the water by wading anyways) so is it really of concern since the casts are generally targeted well out and down from the angler? Even a fish that takes near the end of the swing has not been greatly disturbed by the splashing about going on 100ft upstream...
Loop Canada Pro Staff
FFF certified casting instructor