It’s unknown what exactly changed since Cook part participated in the team’s Return of the Blue & Red scrimmage on Friday night, but a lack of progress in contract talks could be why the back is suddenly having a hold-in of sorts at Bills training camp.

Cornerback Max Hairston suffered a knee injury that is keeping him sidelined for multiple weeks, and wide receiver Khalil Shakir is week-to-week with a high ankle sprain. Now, for the first time this offseason, James Cook is sitting out a mandatory practice. When asked why he is sitting down, Cook just kept repeating, "business."