The silence that followed was tentative and shaky.  Hermione saw Ron swallow heavily as he glared at the Slytherin table.  Really, everyone was looking at the Slytherins.  The Slytherins were looking at McGonagall, some more apprehensively.  Or some, like Malfoy, looked closed off, as if the rest of the room and the tension it carried wasn’t even there.