Ron DiFrancesco told an important story during this “collapse” video on ABC. More than half of his body was burned by the fireball at street level during the WTC 2 demolition. Aired by ABC on 9/11/2002 – a fact now known thanks to the 2010 Int’l Center for 9/11 Studies NIST FOIA, 911datasets.org release 28, folder 42A0282 – G27D4, VOB 2. Thanks to master archivist Gideon52480, who provided the clip to YouTube before that.
Another important witness is NYPD officer Sam Esposito, who was injured in a lower level explosion… and who saw the fireball.
Fireball at Street Level (story during clip)

YouTube 1 & 2


