It's not an idea that's occurred to me before, but I wonder if the power Gandalf was "allowed" to display to the other denizens of ME was not somewhat tied to the level of the threat.
In The Hobbit, Sauron had not arisen in his full might, so Gandalf was required to show even more discretion in the overt use of his power than later in LOTR, when things were quite clearly coming to a boil.
In addition, Gandalf had to have been aware the Eagles had habitations nearby, and was counting on them to show up to investigate the fires.
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Music alone proves the existence of God.
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