Might be as simple as that: the Ring could make Sauron invisible at his own will; when he wanted to intimidate his minions he would take visible shape even when wearing the Ring. Of course, this raises the question how Isildur could cut off his finger, and defeat him in first place, because surely Sauron would have wanted to be invisible in that fight. Gollum the first? [img]smilies/wink.gif[/img]
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