It’s almost laughably simple: for the FBI, a “mirror” is when you repeat the last three words (or the critical one to three words) of what someone has just said. Of the entirety of the FBI’s hostage negotiation skill set, mirroring is the closest one gets to a Jedi mind trick. Simple, and yet uncannily effective. By repeating back what people say, you trigger this mirroring instinct and your counterpart will inevitably elaborate on what was just said and sustain the process of connecting.
