HSienzant - as in Hank Sienzant, thanks.
Near as I can figure, he thinks the shot came from one of the lower floors of what was then the Dal-Tex building -- now the Sixth Floor Museum Bookstore.
I've asked him to spell out on a number of occasions his theory and name the precise location for his shooter and specify the witnesses that saw a shooter in the location he favors -- he's never done better than "behind". He can't do better because as everyone here knows (including MicahJava), there are NO witnesses who saw a shooter anywhere but in the Depository, and there is NO hard evidence (like shells, a rifle, or bullet fragments) recovered from anywhere related to the assassination that could be linked to a second shooter.
And on the other side, we have Oswald's rifle in the building where about a dozen people saw a man fitting Oswald's description or a rifle, or both, in the window immediately before, during, or just after the shooting; we have shells traceable o that rifle at the window, we have fragments of a bullet fired from that rifle recovered from the limo, and a early whole bullet from that rifle recovered at Parkland Hospital.
You might remember Bob Harris favored a shooter in the Dal-Tex building as well, but the best argument he could come up with was "There was no evidence of a second shooter because these guys were professionals and didn't want to get caught"' which explains exactly nothing, and ISN'T evidence for a second shooter anymore that it's evidence for pink unicorns -- after all, they don't want to get caught either.
http://www.internationalskeptics.com/forums/showpost.php?p=10760856&postcount=3287
As has been pointed out to MJ on numerous occasions, he can't go from his anomaly-hunting to a larger theory -- no one can -- because his anomalies don't fit together to make a cohesive whole.
He can't even, within the narrow confines of what he's apparently willing to discuss, avoid contradicting himself. He says he accepts the autopsy, and the autopsy conclusions, but then says there were two shots to the head, which the autopsy doctors never said anywhere, at any time.
Most conspiracy theorists are not shy about alleging all the evidence pointing to Oswald has been planted, swapped, or forged, but MicahJava has been reticent to explain why so much evidence points to Oswald -- there are only two possibilities, the evidence points to Oswald because he was the shooter, or he was framed. MJ hasn't even spelled out Oswald's role in the assassination.
Hank