Clint Hill falls?

What happens if USSS agent Clint Hill falls attempting to jump onto the Presidential Limo in Dallas? Worse yet, what if he falls and is crushed? How will this effect the Warren Commission, Kellerman, and Greer, and the Kennedy opinion on Hill?
 
Firstly, do you recognize this as a minor POD? Because that's all I believe it would be. There's nothing wrong with that, but its a fish in a smaller pond situation then. I don't know how much it really would affect anything beyond another casualty in Dallas if he was run over. Maybe someone picks him up as they start to speed off, though? Panic may lead to him being trampled by the cars; I know human nature enough to know fear makes people flee without concern. But I don't know if there's no way someone's not going to try to get him into one of the cars, or that one of the civilians pulls him out of the way.
 
The problem is is that this can completely shape the way the secret service works though if Clint ends up dying trying to protect the president, technically dying at the hands of a rapidly speeding up William Greer, then this surely most have some sort effect on Secret Service protocol for an extremely long time.
 
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