The screens were pretty annoying, right? Why was Michigan not getting lined up? Why were they having so much success, even on long downs, with this tactic? What was the plan to beat them? How did they adjust? Let's dive in.
Opening up Multiple Fronts
A Walt Bell offense doesn't attack you with the normal array of football moves. They're irregulars, light infantry, moving units across the battlefield with lightning speed and choosing where to engage, which is ideally wherever you're late to arrive in force. The last thing they want to engage in is a battle in the middle. Your troops against theirs? Game over. What they would much rather do is split into two groups, always of varied compositions, use tempo to increase the likelihood of the defense failing to find their others and line up correctly, and use the second before the snap to pick one of those two widely separated points of attack to have the next engagement.
IU's trick was to create multiple fronts, separated by so much distance that defenders had to virtually declare by alignment before the snap which one they were going to be participating in. Bazelak would read the defensive alignment during the second his line was frozen and know which battleground to choose. In this case it was whether Colson (LB on the bottom) and/or Moore (safety just above the bottom hash) were part of the play near the snap or the play out in the flat.
Notice here that the line is run-blocking; they aren't told that the pull is live. But also notice that there's no mesh point; it's not an "RPO"—or at least it's not a post-snap read. The QB sees Michigan only has two guys playing way off for the three guys lined up on the field side, makes the check in his head, and throws it.
This style also dictates how you have to defend them. All those fancy pressures and coverages you use to confound an offense trying to win old-fashioned leverage battles can't help you against Indiana, because they're so spread out that none of your defenders are close enough to each other to swap jobs. Amoeba? Forget it. Want to use Cover 3 to get them guessing if the pressure's coming from the right or left? Get used to Indiana choosing your Rip/Liz calls for you.
I think that's what's going on here.
[After THE JUMP: The adjustments, the reactions, and IU runs out of ideas first]
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