<font size="-2">"'Then you do not pay tribute to Sauron?' said Gimli.
'We do not and we never have.' said Éomer with a flash of his eyes; 'though it comes to my ears that that lie has been told. Some years ago the Lord of the Black Land wished to purchase horses of us at great price, but we refused him. for he puts beasts to evil use. Then he sent plundering Orcs, and they carry off what they can, choosing always the black horses: few of these are now left. For that reason our feud with the Orcs is bitter." (LotR, III, ii)
As for those horses tolerating their riders, fear seems the simple reason. There is a difference between the terror a Nazgûl want want to spread on a battlefield, and the fear he presumably could use to break in a horse. Plus it's probably better than becoming orkish stew [img]smilies/wink.gif[/img]
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