And it's a good thing he dropped it, too. Iron and faerie magic do not mix, but neither do small humans and flaming rock fists, which was enough for Childermass to take the chance over. Back out of the shadows, he also only has the attention span to focus on the approaching elemental. It's only natural that, when Yuya poses that question, he mistakes it to mean—

"What do you mean where'd it go? It's coming right this way!"

Clearly, Yuya meant the stupid fiery abomination still stomping their direction, right?