This perfectly illustrates the problem with Vicky Adams testimony. According to the above, Normans EARLIEST account, the guys on the 5th floor ran down the back stairwell IMMEDIATELY after the shots had been fired. Which of course they didn't. They actually went to the west windows for a minute or two.
People make generalized statements, like Norman here, which people then take literally.
What likely happened is that Adams made a generalized statement early on, which she then later modified into a literal one due to bad memory.