Describing Bilbo “Motherfucking” Baggins, who set out on a very long journey with the express intention of burglaring a dragon, succeeded in that mission, had a casual chat with the, may I reiterate, DRAGON, along the way, walked away alive, and then played a direct role in murdering said dragon, as a “dragon attack survivor” is an interesting choice.

Gandalf is a troll. He exhibited tolling behaviour throughout the books.

Maybe he was planning on retelling the story of their run-in with the dragon and was going to use the firework as his big finish to the story