[Referring to the animation in 'Reply #24'] It is impossible to know whether Kennedy's right hand is rising or falling as it emerges from behind the Stemmons sign. As he goes behind the sign he is in the process of lowering his hand after waving so the probability is that his right hand is actually on the way down. There are many times where Kennedy's right hand is in exactly this position during the motorcade as demonstrated by the still photo in Reply #24. The bottom line is that you don't have the slightest clue what's happening with Kennedy's right hand as he emerges from behind the sign.
As for his left hand rising in earlier frames - that is 100% not true. It is not shown in Zapruder at all. Around z175 Kennedy's right arm is leaning over the side of the limo, his right hand clasping his left. He begins to wave with his right hand and his left stays resting on his stomach area until z225. Kennedy's hand begins to reflexively snap shut in this same frame and is fully closed in z226. Importantly, it is this frame where we see Kennedy's left elbow come up as he reacts to being shot.
He's Superman and catches the supersonic bullet in his right hand, then appears to be putting it in his mouth
My point is that Hinrichs has avoided the prior frames that show Kennedy already reacting. Furthermore, how the fck would anyone be able to get his hands up that fast. It looks like Herr Hinrichs is attempting to depict that the missile would have hit Kennedy in the hands... maybe in support of a frontal throat shot.