Interlocked Scoot Chain Thru

The usual traffic pattern on Interlocked Scoot Back is to do a Couples Twosome Scoot Back, which is probably not theoretically correct. On Interlocked Scoot Chain Thru, it is necessary to use the "correct" traffic pattern. Do a "Stretched 1/4 Tag Extend", resulting in parallel waves. Do the usual Swing, Slip, and Swing, and then a Stretch Extend, resulting in a 2-faced line in the center.