Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

These are details of what happened from Clint Hill, and you'l notice that he says nothing about "physically striking or violently shoving" Mrs. Kennedy, as Dino Brugioni claimed to have seen in the original Zapruder film. Upon reading it, I have no reason to think Hill struck her or shoved her, and I dismiss Brugioni's claim outright. 

https://www.businessinsider.com/here-are-7-new-horrifying-new-details-from-the-jfk-assassination-2012-4