This "quick tutorial" introduces the general idea of a call and explains the most common cases. It does not explain or illustrate all cases. For additional details and/or examples, refer to the links in the "MORE INFO" box.
Partner Tag is a two-dancer version of Tag the Line. The dancers still turn 1/4 to face the center of a line -- but it is a very short line, consisting of just two dancers. They only do a Pass Thru instead of a Double Pass Thru, because there are only two of them rather than four. And just like Tag the Line, they pass right shoulders, regardless of which way they were facing originally.
Because Partner Tag is a two-dancer call, it is important to identify the pairs of dancers quickly before anybody moves. In a line of four, the two pairs will be the dancers in each half of the line. Also keep in mind that nobody goes very far. In particular, starting from a line of four, the dancers who start on the end must stop as soon as they get past one dancer -- they stay in their own half without passing anybody else.