Roll the Wave

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From a wave: Quarter away from the center of the wave ("Lines Divide"), and individually "Peel" in flow direction, adjusting to couples.

\phfour{b2n,g2s,g3n,b3s}	\phfour{b2w,g2w,g3e,b3e}	\phBB{g2e,b2e,b3w,g3w}
before Roll the Wave	after 1/4 away	finished

It may be useful to think of this as U-Turn Back away from the center of the wave, and Explode.