That's all the defender. That's why this is tricky. It looks like it's Feagin. It's not. You have to watch the play in very slow motion. It's clearer (or, rather, clear-ish... which on replays is the bar) that there is a defender under Feagin. No part of his "downable" body hits before the ball pops out.
The beauty, or agony, of it is this: even if we disagree, that means the refs still got it right. We're on the same Illinois bandwagon and can't come to a definitive conclusion what happened. Non-biased refs certainly aren't going to make a decision on this with the video evidence provided. Thus: call is upheld.
Refs did everything right on this play as they are taught:
1. Let the play go due to the turnover
2. Go to video review to make a determination
3. Uphold the call because it's either obvious he wasn't down (my take) or it's not clear if he was down OR reverse it because there is undisputable video evidence (which clearly there is not if everyone has their own take on it).
The result sucked. Refs usually suck.
But hey, Illinios won! So... at least we have that!