Considering the circumstances, I think what Dorran did was smartest. If he had gone in with his large, rohanian war horses, do you think any of the slavers who had seen him would have mistaken him for anything other than a foriegn rider? As it was, if they saw him, they could have easily taken him for one of their own companions. Also, with the wind and sand picking up, Dorran needed to be as close as he was in order to see what happened to Athwen. If he had been back with the other ex-slave riders, he wouldn't have been able to see clearly and wouldn't have been immediately aware of her danger.
Dorran would have done a bit of riding before going out with the strange horse. He is also very used to working with horses, so he could probably adapt pretty well and fairly quickly to Rog's animal. Of course, it
would have been nicer and much more convenient if he had been able to use his own horse, but it wouldn't have worked quite as well.
I think it was fine.
I'll try to post something tonight.
-- Folwren