I couldn't find anything in the NCAA rulebook about it, but can you hit a receiver if you're a DB when the ball is tipped by that receiver? I wish I had the video to show you, but I saw this a couple weeks ago. Nicholls State has the ball 2nd and 9 at the Western Michigan 30 early in the 4th quarter. NSU#12 throws a pass tipped straight up by the NSU receiver. WMU #7 after the tip, leads with his shoulder and hits the NSU receiver in the upper back area sending him to the ground. WMU #7 gets called for a personal foul even though the ball was tipped and the receiver still could have caught the ball.
What was that for? I know in the NFL that would have been legal.