Eragon ran as soon as Horst was out of sight. His legs burned as he pounded down an alley and back to the trees. He slipped between the tree trunks, then turned to see if he was being pursued. No one was there. Relieved, he let out his breath and reached into the tree for the leather. It was gone.

     The tone of this passage seems to be paranoia. It exemplifies this by giving a description like "His legs burned as he pounded down the alley...," it would take some determination to run through so much pain. Another example is "...then turned to see if he was being pursued." He was relieved that no one was there.This all seem like he was being a little paranoid.