The official roster cut-down day in the NFL. However, with those roster decisions more likely to be detailed in the final episode, Episode 4 opened with McDermott guiding a late-preseason practice, with the Bills' staff also highlighting what they look for in players to keep them on the roster."Hard Knocks" then takes a look at bio-mechanic systems and cameras that are used to break down the Bills quarterbacks' arm motions, including Josh Allen's. Wide receiver K.J. Hamler is once again highlighted as he competes to make the team, and the show looks back on his 2023 pericarditis diagnosis. A spotlight also remains on Ciarlo, who shares how he unexpectedly saw time at nickel in a preseason game, and Frank Gore Jr., who breaks down his relationship with his father.The episode features a brief segment on DT Casey Rogers helping with a local dog rescue program, then it cuts to general manager Brandon Beane and the front office assessing where they stand on the bubble roster players before a final preseason matchup against the Buccaneers. Prior to the final game action, Allen and some other players sing along to "I Write Sins Not Tragedies," in a highlight sequence.McDermott sits down for some advice from two NBA Hall of Famers, Vince Carter and Tracy McGrady, who are minority owners of the Bills. The head coach later tells his players that he's proud of them and the work they put in, and the final portion of the episode is footage from the Bills vs. Buccaneers preseason matchup.Included from the game are shots of Vince Carter briefly talking to Allen, Shane Buechele getting the start at quarterback, tight end Zach Davidson being used as an emergency punter, Tampa Bay's Shilo Sanders throwing a punch and being ejected, Ciarlo recovering a fumble and Buffalo claiming a 23-19 win.