49ers RB Trenton Cannon taken off field in an ambulance after opening kickoff

Photo by Norm Hall/Getty Images A scary injury at the start of the 49ers matchup against the Seahawks. On the opening kickoff of Sunday's game between the San Francisco 49ers and Seattle Seahawks, 49ers running back Trenton Cannon remained down on the field for a prolonged period of time after a scary collision with several players, including teammate Talanoa Hufanga.Cannon remained down on the field for an extended period, and both teams dropped to one knee while medical staff present attended