Devin Langford says the bullets that hit the car stopped it from working
                                
                                
                                    (Newser) -
                                    The last words Devin Langford's mother spoke to him before she was gunned down in Mexico were words of protection. "Get down right now," Dawna Langford instructed her 13-year-old son, he says in an interview with  ABC News . Devin—whose brothers Trevor, 11, and Rogan, 2, were...