Snap the Tag <N/4>
This is a tagger. First, all Partner Tag. Then the ends U-Turn Back, and then
all Extend as many times as needed. The tagging is always right shoulder.
From a right-handed wave this is the same as Flip the Line.
When the "Reflect" modifier is used, an ambiguity arises, because this is
a tagger with another tag inside it. The caller may want the "Reflect" to
apply to the initial Partner Tag, that is, Partner 1/2 Tag, Arm Turn 1/4, and
Step Thru.
Due to ambiguity with the call "Snap", the caller must always say "Snap
the Tag". It is improper to say "Snap Your Neighbor". Also, "Snap Back"
is a different call.