From facing lines: Centers Crosstrail Thru as the ends Pass Thru. All do a U-turn back. Finishes in facing lines.
From a squared set: Designated active couples will face partners and Pass Thru while the others Crosstrail Thru. All U-turn back. Finishes in facing lines.
NOTE: Different rules for different set-ups is usually enough to kill a move--or at least to kill the use of one of the versions. This is also an unusual use of the term "Scoot".
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.