when I told you to hunt him down and kill him, you couldn't find him. That's what it means
Riverrun belonged to House Tully for a thousand years. Now it's mine
For 300 years we kissed Tully boots, swore oaths to them and their stinking fish banners. Not again. Riverrun is ours
If I have the sense the Gods gave a fish, I'd hand you both over to the Lannisters