I'm guessing that the two metal bars supporting the swingers were considered targets. I know that from your prone firing position, you could not see the paper targets until you had shot their feet out and made the targets swing down onto their sides.
I felt terrible for one of the guys on my squad who went completely dry trying to hit those bars. You couldn't help feel for him when he realized that he just shot through his last mag (exacerbated by the fact that not only were Sevigny and Langdon squadded with us, but that we had 20-30 people watching us at any given moment on Friday).
An small, but interesting aspect of that Stage was the decision to reload or not before going prone. At the start signal, you engaged two targets with two rounds each, then went prone. If you shoot the stage clean, then you need to only expend 10 rounds (four paper, two metal "legs"). But if you have more than one miss on those legs and didn't tac-reload before going prone, then you are going to have to do a prone reload (those legs were 3" wide, angled away from you, and about 10 yards down range...not the biggest targets in the world). If you are ESP or SSP, do you tac-reload or not before going prone? I saw lots of competitors take the insurance and reload before going down, but ironically, I didn't pay attention when the superstars on my squad (Sevigny, Langdon, etc.) went through the stage. Again, minor but interesting.
-Jim