Dramatic video shows the moment quick-thinking Mississippi middle schoolers worked together to stop their school bus from crashing after the driver passed out behind the wheel on a 4-lane highway. Heart-pounding security footage obtained by ABC News shows the five Hancock Middle School students bravely stepping up and bringing the bus to a stop after spotting driver Leah Taylor’s head hanging limply after she suffered a medical episode while barreling down a highway in rural Kiln on April 22. “She kind of fell over, like flopped over, and everyone started standing up,” one of the brave students, McKenzy Finch, told WLOX . The footage showed the five working as a team, with each taking a key role to save Taylor and their classmates’ lives. Five students stepped up to help when the driver suffered a medical episode.…