I'm pretty sure this scene is after Marquis Gray made a dunk and then gestured that he had slit Iowa's throat. This resulted in a minor controversy about taunting another team. In any event Coach Izzo was upset, and literally in his player's face:
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After this moment Marquis grabbed Izzo around the neck as they dealt with whatever the issue was. It's clear Tom Izzo has an up close and personal relationship with each of his players, him the dad to young men a foot taller and a hundred pounds heavier.
Here's an album with 150 or so photos from the Iowa game. Dammit, Trevor, you and Muldster both have better lenses, but you can zoom in on these photos for some good closeups.