How do we know Connally was reacting to being hit? Maybe he was just reacting to a round landing within a couple feet of him. If the round did come through the windshield it would have passed within inches of Connally's head.
I find it questionable that after having 4 inches of rib blasted away he would/could twist around to his right as far as he could to see JFK. Secondly he holds his Stetson in his right hand after having his Radius shattered and the tendon to his thumb severed. Then he articulates his wrist downward to fit his hat between him and the door of the limo as he twists around to see JFK. If a round passes through your wrist I doubt you would then bend it like he does.
Very good question. Connally said he reacted to the shot - the first shot - that he believed struck JFK because he heard it and knew it was a rifle shot. He feared an assassination was unfolding and turned to see the President.
The evidence is consistent that the first shot struck JFK so what you see after z230 is Connally's turn to see JFK which he said he did before he was hit in the back on the second shot. The vast majority of witnesses who recalled a pattern to the shots said the last two were closer together so Connally was hit many frames later. Greer said he turned around immediately after the second shot. His turns just before z280. That is just after Connally is hit.
The irony is that with this evidence (first shot hit JFK, first shot was after z190, last two shots were closer together) there is no need to explain a missed shot for which there is no evidence and there is no need for a second shooter. Oswald could easily have fired all three.