The <anything> call is one where the modifier "(Centers) to a Wave" would result in a 1/4 Tag. The dancers do the <anything> call to that point, and then do a full Chain Reaction (or Cross Chain Reaction). Conventions for how the <anything> call is named in this context are explained in the subsections below.
From Parallel Ocean Waves: Scoot Back (or Scoot Chain Thru), Centers to a Wave (i.e., leaving off the final Extend); then do a full Chain Reaction (or Cross Chain Reaction). Note that for a Scoot Back, the word "Back" is not spoken.
The starting formation depends on the <tag> action. Do the Scoot Back variation of that tagging action (i.e. get to the 1/2 Tag position and then Scoot Back) leaving off the final Extend, then do a full Chain Reaction (or Cross Chain Reaction).
Note that there is an unspoken "Back" (Scoot Back) in this case, e.g., Tag Reaction means Tag Back Reaction. The center wave always does the trading action of the Scoot Back before starting the Chain Reaction.
For any other applicable call, do that call (Centers) to a Wave, then do a full Chain Reaction (or Cross Chain Reaction). This is most commonly used at C-3A with calls in the Transfer the Column family, e.g., Triple Play Cross Reaction. (Note: The specific case of Open Up the Column Reaction is typically abbreviated as "Open Up Reaction".)
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