The dwarven bards must have used Song of Freedom, making them at least 12th level. That level is supposed to be rare. Sidgi must have called in a lot of favours to get those kind of reinforcements.
You mean like paying to resurrect one of the bards and saving his soul from Hel in the price? Because that is a difficult to impossible favour to repay.
Also it could double as a nod to a few cinematic movies where a titular character’s hammer flies to him from a long distance (sometimes with a punchline involved)
Maybe this is how Curly dies?
Light the lamp not the rat LIGHT THE LAMP NOT THE RAT!!!