Ok, the roa'an are able to send their thoughts and receive the thoughts of their E'eld riders. The E'eld however are not able to send their thoughts. It's all the ability of the roa'an themselves, thought it would appear their riders send as well as recieve. Actually they only receive what the roa'an sends them, and when they think, the roa'an can pick that up....  

 ok... I think I confused even myself there  

 Hopefully you get the idea. 
The following is a conversation by Tia'ialla (Tia for short 

 ) and her roa'an, Silverprince. They have just left the burnt out remains of the temple where his fellow brothers were slaughtered. He now carries the sword of one their attackers and has vowed that he will protect himself and others rather than die in vain, needlessly as his brothers did. He has taken to heart the words of Jandrous, the One True King in their holy book "The Teachings"... "Prepare for war! For although you are priests of love and servitude, you are also warriors of the One God!" 
Note: all words in quotations are written in italics to suggest thought rather than spoken word in the story itself..... I'm just too lazy to do it here  
 
 The large roa'an she rode, sent her his thoughts.
"There is anger."
"Yes, Silverprince. There is anger." She sighed. 
"It does not feel vengeful, however," The roa'an thought. "It is more a... righteous anger?"
"Yes, I believe so. He is angry and very sad that his brothers died needlessly, and will not allow the same for himself. Nor for others, I believe." 
"He will protect himself and his herd. I would do the same." 
"Yes, Silverprince," Tia replied, and patted her mount on its broad neck. "I believe you have the right of it." 
"More sadness comes... " 
"Yes, my Roa'an friend. I'm afraid so. More sadness for all of us, I'm afraid." She looked at Marek, who rode silently, tears streaming down his face once more. 
"His heart is stronger than it now seems," the roa'an thought to her.
"I hope you are right, for all of us."
Thoughts?