We need help on a C3A call we heard Wed night. If the call is a Double Pass Reaction

1. Do you do a double pass to the 1/2 Tag and then Scoot Back to a Wave and then Chain Reaction? or
2. Do you do a double pass to the 3/4 Tag and the end u-turn Back and then Chain Reaction??

For some reason, my gut says do #1 - the net result is similar either way but!

The definition on your site or calllab did not say. Thanks for your help