No doubt it was a great hit. But here's a different perspective: Clowney is 6'6" and weighs 260. Vincent Smith is 5'6" and weighs 175-ish. How many 5'6" guys get up after that hit? Vincent Smith: toughest guy on the field.
The nutty Michigan coverage isn't so much about Harbaugh as it is a signal to the Big Ten that Fox wants to party.