Yup that one.
I don't think I'm being bias am I? That's a foul. I don't think Haas was playing dirty or trying to hurt Tate, I just think his eyes were up, and he lumbered into a much smaller Tate, sending him sprawling.
From this clip I can't tell where the refs eyes are during the foul, but in the reply during the game you can watch the ref turn his head and follow Tate's slide to the camera man. I inner monologued for the ref "So how far are you going to slide Mr. Tate, I'll call a foul if you make to the fans. Aww, the camera man stopped you. Play On!"
Tate didn't get up from the play, he laid out of bounds grabbing his lower back. After Purdue drained the 3 the refs called injury timeout, and we see Tate still on the ground, and then the trainers helping off the court where they continue to work on his lower back. In my head, I actually called the game there, I didn't think Bates-Diop could do it all on his own. (And he didn't, the bench was awesome, and Tate came back in on the next play stoppage.)
Sidebar: Tate is a very emotional payer, did he not get the call cause the refs thought is was gamemenship on Tate's part and not a foul?