From any formation achievable by a fractional tag: All walk straight ahead into the formation that would be reached if another Quarter Tag were called. On Extend the Tag, One Quarter Tag formation changes to Half Tag (parallel waves); Half Tag formation (parallel waves) change to 3/4 Tag; 3/4 Tag formation changes to completed double pass thru formation although in this case the term Complete Your Tag would be used.
NOTE: As in the case of Complete Your Tag, the original idea was to move into the fractional tag formations by an actual Tag the Line call. In practice, this is not always adhered to.
Jim Davis 1972
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.