Ronda Rousey used her signature armbar to stop Gina Carano just 17 seconds into a comeback bout between the two MMA fighters.

Gina Carano knows it sounds preposterous to return to a sport as dangerous as mixed martial arts 17 years after her last bout.

Ronda Rousey and Gina Carano aren’t bothering to pretend to hate each other this week. These trailblazing fighters have been through too much and been away from mixed martial arts…