Cariad has decided to take matters into his own hands.
'If we want the Rangers' help, we'll have to tell them why the wizard's spies have come. I'll need you by my side for this; if I go alone, they'll see me as a Dunlending and nothing else. But if they see you as well, they might be more convinced of my peaceful intentions.
'I'll go on ahead. I'll be waiting for you on this side of the river, outside Tornhad.
'Should something happen to me, tell Erlys and don't worry. Like I said, my people are strong, and so am I. I've suffered much worse.'
Cariad will be waiting for you outside of Tornhad, south of the river.
You should meet up with him.
It seems Cariad has not escaped the sharp eyes of the Rangers.
You should talk to Lagordal outside Tornhad.
With Cariad captured, the next thing to do would be to notify Erlys.
She can be found in the Cuan-lûth Refuge, to the north of Tornhad.