SoRCon 11 23-25 Feb 2018 Basildon UK http://www.sorcon.co.uk
This is how a PAIR card works:
1. You play a card with PAIR (and it is not cancelled by SHAME ON YOU!)
2. You get a chance to play its counterpart card as if it is FREE
Slightly dangerous explanation, because although the card doesn't count against your one character card limit (like FREE cards) it isn't FREE in that it isn't affected by things that affect FREE cards.
(Contrast this with some Buka characters that do behave as FREE in some circumstances, and are affected by things that affect FREE cards.)