He will be executed by the soldiers escorting the chain gang.

Controller vibration when not walking fast enough.

You can let them drag you the whole time. I did and nothing happened. One of the soldiers beats you and says get going but after that nothing serious happened.

If you refused to walk, the alternative cutscene would be triggered and they end up killing you so the mission failed.

Also, you could notice the controller was vibrating when you’re not walking.