EDIT:
TLDR
I asked The AI.
Referee restarts the clock with the arm wind signal. No whistle needed. Side judge has to be on the new LOS, but the chains don't have to be in place. It was the referee who was so far out of the picture and is the only one who apparently saw the MI player on the ground. Nothing was happening until he was ready and he was miles away. Even if he ran up there, the Iowa players seemed to be ready and set as the officials were getting into place.
I found that whole sequence fascinating. I wanna know what Brown was communicating to Diaz. He was for sure communicating with him verbally and with hand signals,
Original post:
Also.....
People who know the rules.
That sequence at the end...take the Michigan injury out of it for a second.
First down. They have to set the ball. I assume they blow a whistle or make an arm movement to start the clock? There was an official on the sideline, looked like he deliberately had a foot on the ground...I assume marking the new line of scrimmage. All the Hawks appeared to be lined up and more or less set before any whistle. Then there was immediately a whistle....but it was someone blowing it repeatedly. I assume that means "stop everything" because there was the injury.
But the dudes with the chains? They were nowhere near close. The first down end of the chain was still 12 yards away when the Hawks appeared to be 'set'.
Do the chains have to be in place? Or is that side judge standing at the LOS count as good.
I've watched it several times just trying to decipher everything that was going on.
Looks like the official in the white hat was the only one who knew about the injured player. He casually walks into the screen from the far left blowing his whistle and waving his arms. Another official way back there then turns and looks and sees the guy on the ground (presumably) and points. Looks like the official on the far side who was marking the LOS.
I thought Brown was communicating with the sideline for a bit. Because he looked over and made a move with his hands....each hand on either side of his helmet kinda of looked like a "neener neener neener" move a kid would make. But that was towards the Michigan sidelines. So maybe he was trying to communicate with someone in the booth.....but no. It's clear he was either saying something to Diaz or James. I assume it means...."go do that thing, in the endzone we do". After one last watch here, he was communicating directly with Diaz. Regardless of the chain thing, they were set and ready to go...Diaz had a play....and he would have made it. 100%.