The emissary of Isengard has left you with an uneasy feeling. You should track him and see if the White Hand encampment shows any signs of rallying for retribution at the Stag-clan's refusal to join them.
'Elain will find Guto and bring him back in good time, but at the moment I am more worried about that emissary who stormed back to his camp.
'Will you track him, ${PLAYER}, and warn us if you see signs of retribution for our insult? We can escape to the hills if we have warning.
'That man did not speak of war against us, and I cannot see what they could gain from it, but I am worried nonetheless.'
The half-orc emissary retreated southwards towards the White Hand encampment, probably following the road.
You should follow the emissary and make sure that he does not plan to attack Lhan Tarren after being insulted by Riagán.
It can only be hoped that Guto and Elain are safe at least, since they were not there during the attack.
You should seek them in Lhan Tarren and try to help recover from the attack by the White Hand.