There was something that Eragon never told Roran.
Not because he feared his reaction, or cared for his opinion, he just never thought to share. It was his own business, and Roran didn't need to know.
He could hear voices.
He could hear them from the time that he could remember.
They always spoke to him right before disaster struck.
There was the time where a group of travelers got lost in the forest and torn apart by a pack of wolves. He found their bodies the next day.
There was the time that woman fell over the cliff at what the people down below called the Igualda Falls.
Then there was the time he found Roran.
That was probably the first time the voices had ever spoken where nothing had gone horribly wrong.
He'd told his master about the voices before. This was what his master said: "They are voices of the dead."
Eragon didn't know whether to believe that. His master would say things that he took as fact but the thought of the dead speaking to him was a little off-putting. Then again, stranger things have happened in the Spine and there was a possibility that the voices he heard were voices of those who had long passed. Graveyards weren't uncommon in the Spine, after all, and with Eragon's tendency to go to places where he shouldn't, he could well have picked up something along the way.
Whatever the reason, ever since then, Eragon had sort of a sixth sense when it came to the other boy.
So when he first had the feeling that told Roran was in the forest, he ignored it.