iStockphoto / efks / IMAGN IMAGES via Reuters ConnectThe Atlanta Falcons began Tuesday by giving Bijan Robinson the richest running back contract in NFL history. Jalon Walker’s Breakout Season Ended Before It BeganRobinson agreed to a three-year record extension worth up to $75 million, including $51 million guaranteed and a $37 million signing bonus. Walker went down near the end of the team’s sixth practice while the Falcons were running a two-minute situation. Walker was eventually taken away on a cart, and Atlanta ended practice immediately afterward. Instead, Walker’s season ended during a practice without pads before Atlanta played a single preseason snap.