South Tower squib appears 35-40 floors below initail collapse

At appx 3.5 seconds into the video, you can see a squib on the collapsing tower, near the bottom middle of the screen. There is no reasonable way to explain this occurance via “the pancaking” theory. This squib appears to be around 35-40 floors below the actual collapse when it first appears. I froze the the squib from the video and made a "still" . I am guessing the debunkers will claim this was caused from "air pressure," which would mean the other 35-40 floors were "air tight." (impossible)