1 - Polyphemus heard a prophecy that he would lose an eye to a hero in an attack.<span> 2 - Zeus' sign of the attacking eagles and Halitherses' prediction of Odysseus' vengeful return.</span>
<span>"an enormous ornamental bat", because this is a humorous mental image, and
"as the atmospheric conditions demanded", because this is saying that the atmosphere and weather could make it necessary for someone to look a certain way (that's what is meant by putting on airs) rather than to actually stay dry or warm.</span>