"Slughorn turned on Dumbledore, his expression shrewd."

I received my copy.

I'm pretty sure this certain sentence fragment contains a typo:
"The misty fug his breath had left on the window sparkled..." pg.42

The definition of fug, a steamy, humid and murky air environment, doesn't seem to fit in the sentence.

In conclusion, the London bombings were probably caused by Death Eaters.