It’s very obvious that they want to indicate they aren’t hostile, but remained cautious.
Rob opens his hand to tell the rest of his guys to follow suit. They relax their posture but Rob continues to hold his hand open behind his back and waves to Riley to start running. They still had a few seconds before the bend in the track was lost as an obstruction to his movements. As he takes off in a sprint Rob steps forward and nods to the Sergeant to walk with him.
Rob: Is this kinda shit normal around here?
Davis: Hell no.
Rob: You do the talking, you’re a local and I’m not. I don’t want my accent to be some sign that they can talk bullshit.