Roll the Wave

From a wave or line: Quarter away from the center of the line ("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}
2 2 3 3 2 2 3 3 2 2 3 3
before Roll the Wave after 1/4 away finished


This is now also called Roll the Line when the formation is not a wave.

It may be useful to think of Roll the Line / Wave as: U-Turn Back away from the center of the wave, and then either Explode or Bend the Line, as applicable.

\phfour{b2n,g2n,g3n,b3s} \phfour{b2s,g2s,g3s,b3n} \phBB{g2e,b2e,b3w,g3w}
2 2 3 3 2 2 3 3 2 2 3 3
before Roll the Line after U-Turn finished