Lone Gunman Advocates tend to see things like the simultaneous rising of JFK's and JBC's right hands in Z-225 - Z-226 and the outward flap of Connally's lapel and tie in Z-224 (iirc) as indications that JFK and JBC were both struck from behind by CE-399.
If you're a Conspiracy Theorist, what do you see in the Zapruder film that leads you to disavow the Single Bullet Hypothesis?
JBC's continuing to hold onto his Stetson way past Z-222?
JBC's "speaking while turning around to see where the shot came from and whether or not JFK was okay" way past Z-222?
What?