You are another that is short on detailed foundational knowledge. You need to bone up on Euins WC Testimony and the structures which stretch down the Elm St. Extension. In Euins WC Testimony, he indicated on a map where he 1st came into contact with Officer Harkness. This point of contact was where the buildings running down the Elm St Extension end and a FENCE then begins. Inside this FENCE is ANOTHER LOADING DOCK. This additional dock also connects to the TSBD. If you continued walking directly out into the railroad yard from the end of this chain link fence, you would come to the Check Point that Harkness set up out there in order to secure the back of the TSBD. This would be where we see Harkness and the "No Glove Cop" within feet of each other on the Darnell Film. Belin asked Harkness - "BEHIND the builiding?" And Harkness replied, "NO sir, this area right here".
I don't mind helping you out, but please do your necessary JFK Assassination research beforehand. Thanks
I'm assuming that by "FENCE" you're talking about the v-shaped chain link fence between the first RR yard spur and the TSBD parking are west of the annex covered parking. He could also be referring to the GK picket fence; he doesn't specify. I'm going to bend cardinal directions a bit so they match the main downtown Dallas street grid. The chain link fence meets the Elm St extension west of the TSBD and well clear of any part of the Depository.
In the Darnell film, it is easily apparent that Darnell's position is in line with the south curb of the Elm St extension, and that Harkness is about 25-30' north of Darnell's position. Which would put Harkness more or less in line with the north side of the Elm St extension. In turn, this puts him directly west any position he would have taken next to the fence. And not by that far. So, if Harkness is not behind the TSBD when he's on the ESX near the fence, he's also not behind the TSBD when he's at his position in the Darnell film.
That being said, it's worth repeating that "behind" is the opposite of 'in front of." In front of the TSBD is to the south of it. That would put "behind" to the north of the building. The Darnell film shows Harkness to the west of the SW corner of the building. Anyone with the sense of a mule can figure this out.