Robert Humbles, 14, fatally shot 15-year-old Aaron Richardson after Facebook and text message threats were made between their two “rival groups,” according to trial information filed Tuesday.The two groups met in the area of 361 16th Ave. SE on Sept. 6, and Richardson and Deshawn Lemont Hull, Jr. were yelling and in possession of a gun as Humbles shot Richardson, according ot the court the information.