He bound it to his spirit, in a similar way to how Gandalf (apparently) bound Narya and Glamdring to his spirit, even after his death on Zirak-zigil. At least, that's my opinion.
Don't ask me how they did it; they're Maiar, after all.
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"If you're referring to the incident with the dragon, I was barely involved. All I did was give your uncle a little nudge out of the door."
THE HOBBIT - IT'S COMING
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