I remember that. How the hell did that happen?
They simply got a little ahead of the timing on the scripts they were reading.
I recall one of the main anchors with the inset screen of the towers on fire getting in a field report.
“This just in, one of the towers has collapsed! One of the towers has collapsed!....um, well, um, the video that is up on the screen is live and both towers are still standing, so...”
About 10 minutes later (longer than a video delay for censoring) the first tower collapsed.
I’m guessing that the field reporter said something like “We have been told a tower maybe about to collapse and we are being moved away from the site.” And amidst the noise and confusion it was heard wrong.