The dark rider

In this video I demonstrate how to complete the sword of Urfael mission the dark rider to prevent the slave executions, and complete the bonus objective for some extra Mirian by ensuring 5 uruks are killed with Caragor bite attacks.
Be sure to pay attention to your Caragors health as it is easily dwindled away by uruk attacks and is replenished slowly by killing uruks with bite attacks. If you caragor dies that's the mission failed