Your path now diverges from that of the Grey Company, and Halbarad wants you to make your farewells before you take your leave.
'Ah, you do not need me to tell you these things. You have seen within the Ring of Isengard and escaped to tell the tale! You will be of great help to Prince Théodred, I do not doubt it.
'I saw Corunir down the path to the north-west not long ago. You should find him and bid him farewell.'
Corunir was last seen down the path north-west of the camp in the Gravenwood, by a large boulder.
You have spoken with Saeradan, and he told you to find Corunir and say good-bye.