In case you missed it in Tim's preview, this happened:
"Manny has made great strides both on and off the court over the last three years," Beilein said in a release. "Unfortunately he used poor judgment on Friday. It is best for Manny's future if he stays home and sits out this Purdue game. We will meet with Manny and the team again when we return to determine if he has learned enough from this suspension to rejoin the team for Tuesday's game. I am confident that this learning experience will be valuable in the future to both Manny and our basketball program."
Punch thrown? I can't think of much else that would warrant a suspension. Maybe Chris Kramer snuck into practice and Harris gave him a flaming elbow drop.
This reinforces my opinion on Harris's potential departure: he's not likely to go in the first round, but he's probably going to leave anyway. He and Beilein are not on the same page, it appears.