duster vs g;ass

From downstairs Thomas suddenly shouted, "Harry!"
I whirled toward the door in time for the window, behind me, to explode in a shower of glass. It jounced off my spell-layered leather duster, but I felt a pair of hot stings as bits of glass cut my neck and my ear. I tried to turn and had the impression of something coming at my face. I slapped it aside with my left hand even as I ducked, then hopped awkwardly back from the intruder.


Small Favor Chapter 12, Page 100