Other mistake: The red priests escort 6 girls in the white cloaks down to the dock, to be sacrificed. Yet during battle with the red priests, the only girl Dar and Seth save is Kiri.
Other mistake: The head Jud fires an arrow at Tal and the boy goes down. Yet that same Jud does not shoot at Kiri when she runs to Tal's side.
Other mistake: After the raid Dar's village is burning, left in ruins, and one of the last huts goes up in flames but then explodes like an inferno. Purely for dramatic reasons, rather than just plummeting to the ground like the other burning huts.
Other mistake: When the hunter throws his cross-x at the witch's backside, the witch screams a second before it even makes a strike sound. And when he goes to pull the cross-x out in the far shot, there is nothing in her back.
Answer: The creatures did not eat Dar because the eagle landed on him, showing him as a friend to the eagle. They apparently worship eagles, as also indicated by the talisman they give him.
Jazaray