When the Mexican drug lords sent their people to attack Texas Tech, they may have penetrated campus security. And they may even have been able to find blind spots in the fixed defenses that made it difficult for automated systems to shoot them. But Dixie and Twilight had been working for months on robotic bodies that could move just as quick as their human friends and adversaries. The bodies were built to blend into the crowds, just two more college girls enjoying their graduation day. They were a complete surprise.