Thieves' Auction strange Aura behavior

> 8/1/2005 | If you choose an Aura, you can put it on any permanent it can legally enchant. If there is nothing it can legally enchant, it remains exiled, and it can still be chosen by you or another player later in the auction. If there comes a point where only Auras and no legal permanents left, they stay exiled permanently.
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This is what the ruling for Thieves' Auction says, but you can pick an Aura with it even without having anything to enchant with it at the time of getting picked; it doesn't return back to the Auction pool, it enters the battlefield like a regular standalone permanent and upon resolution of the Auction simply vanishes into the owner's graveyard. It would also be worth investigating whether Auras do behave normally even if they have a permanent to place them upon at the time they were picked.