other person. no, i don’t mean go out and buy an outfit just like theirs. that would take too long, and they might suspect you are up to something.
you match their body language, and other non-verbal behavior, and everything you can about their speech. if they speak slowly, you speak slowly. if they smile when they speak, you smile when you speak. if they cross their legs, you cross your legs.
many people are afraid they are going to get caught doing this. but this hardly ever happens. if they scratch their nose, and you stare at their nose intently, and then stare at your hand, and then bring it slowly 