Echoes... all you hear is initial gunfire and echoes. You have large odd shaped buildings all around giving multiple surfaces at odd angles for echoes.
That’s all there is... echoes.
Sorry if that doesn’t meet your desire for a more exciting story.
I’m looking for a convincing explanation...and can almost buy echoes, but if you look at a layout of the area, there seems to be alot of empty space in the vicinity of that hotel.
Explain the muzzle flashes on the lower floor, too. Just bizarre. They’re in an awfully strange location to be reflections.