At the next commercial break I went back and watched it.
Nwankpa disappeared into their sideline, surrounded by Indiana's players. He got up, didn't celebrate, didn't taunt anyone, simply tried to quickly return to the field. Several Indiana players faced him directly and clearly didn't allow him to return to the field. It appeared he got knocked down at that point. I couldn't see exactly what happened after that, but it was somewhere between shoves and punches.
That's an extremely dangerous situation, and the kind of thing that can get real bad, real fast. Like fans jumping out of the stands, a coach swinging at a kid, major brawl, etc.
There HAS to be a flag for at a minimum not letting a player exit your sideline and get back on the field. I thought there would likely be ejections, too, although it is hard to tell without closer camera angles.
If I'm Iowa, I would be trying to get any and all footage of that and send it in to the league. Maybe it looked worse than it was, that in fact Nwankpa was mostly just bumped a little, slipped and mostly talk after that. But still worthy of at least a flag in my opinion.
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