After locating Ratbag, it's time to dispatch the Uruk below with an aerial attack.
After delivering the killing blow, every Uruk in the encampment is made aware of your presence, including Ratbag. Combat is your only option. You have to eliminate all Uruk, but be sure to keep Ratbag alive so you can use him to get to Orthog Troll Slayer.
Once you have eliminated the opposition, Ratbag will attempt to flee. Chase him. Use your Wraith abilities to kill the two enemy Uruk that appear once you turn the corner, then take position on the overpass and ready your bow. Take aim at Ratbag's leg, and once ready, fire. This should immobilize and weaken Ratbag, allowing you to close the distance. Once you approach Ratbag, grab him and use your Wraith abilities to dominate him. Ratbag is now at your mercy.
Trivia
- Talion had a previous encounter with Ratbag, which Talion lost. For killing Talion, Ratbag received a promotion.