We don't have a contract with him
When teams line up across from each other on game day, there is an understanding that each side is committed to stoping the other at all cost. When the same team splits into groups and lines up across from each other at practice, there is an understanding that things won't necessarily be at full speed or intent.
Still, Parmalee doesn't ever want his guys depending on someone else's plan. They need to be fully focused on theirs, in games, and even in practice. If the offense and defense are truly going to make each other better, there has to be some form of iron sharpening iron and teaching going on. So the running back unit dials in on their objectives.
Which is why the running backs constantly hear, "Remember, we don't have a contract with him."
The "we" in this situation being a rusher, and the "him" being anyone who dares to stop them.
"You can't expect, pretty much, one thing doesn't mean they won't do another," explained Hubbard. "Like just because we game plan something in a certain way thinking they will react a certain way, but they don't have to, there's no contract to make them do it."