At the time these Hughes frames are taken,
-----------------Mr. Oswald is standing over west in the doorway, on the fourth step. He takes a sip of Coke. We see no flesh of his LEFT hand, because he is holding the flag behind him
-----------------A laid-back Mr. Lovelady is SITTING on one of the upper steps, content with getting a glimpse of Pres. Kennedy when he passes right by the building. He has a decent enough view, as there is no one standing in front of him.
But then, without warning, and just as Pres. Kennedy is about to come into Mr. Lovelady's view, Mr. Oswald blocks his view by waving a flag--not up high, but to his side
And this is what Towner shows. Look closely at the flag when it is at
higher elevation------------we get a glimpse of Mr. Lovelady's shirt behind it. Because Mr. Lovelady is
sitting there on one of the top steps, just like Mr. Shelley said:

As a result of having his view rudely blocked by what Mr. Oswald is waving right in front of him, Mr. Lovelady rises to his feet. Which is what is happening in these Bell frames, which show the doorway just seconds after Towner:
