Similar to the Louis Cartwright shuffle? If so, its just basically a fast defense that doesn't cross too much. Watch Louis on an inside foos DVD and you will see better than I can explain it.
As far as I can remember, Louis' "shuffle" which you might call the Boston Shuffle, is release points based, as opposed to the Weeseeyana shuffle I remember ... motion based to hide the hole. Very good against some forwards that look at the closest inside holes the D is giving them. Not too useful against a solid snake that can hit both the standard 3/4 posts at will, or easily extend to hit the long or 4/4 deadbar shots. Prolly why I don't think I ever saw Louisiana pros/PMs Russ King or Ted Scott use it in those dozens of times over the years when they came down to the Tampa FL States or the Sunshine Opens from 94 to 2006. Especially when defending Terry Moore or Chris Cavalier Michael Bates, or the other heavyhitters. And most snakers, from rookies to Pro, have gotten EVEN better and better since those days, with the help of all the videos and all the experience gotten from the tour, to hone their shooting technique.
Be that as it may, a good shuffle sure weeded out the duff snakers from the real "pick a point and hit-it" shooters. And it seems to discourage straights even if the shooter scores the first one or two. Seems to be another good defense that can be thrown at a hot, quickshooting snaker. Another weapon in the bag, nice to have.