I'm watching a documentary movie on the history of Roman Empire. There's a part where the narrator says "In 113 BC, the Roman General Carbo parleyed for peace with the barbarians. Then he turns around and murders their ambassadors."
Meanwhile in the enactment the actor playing Carbo actually 'turns around', faces to the opposite side towards his soldiers and signs them to ambush and kill the opposite party when they are gone.
Has this phrase 'turning around' got some significance more than the literal meaning?