Leventhal interviews Walsh (the infamous "Harley guy" who pitched the first official story as a civilian), and as they go about their seemingly rehearsed interview, 'Men in Black' uniforms loom around them performing suspicious activity.
It shows the following during that interview (in order of increasing shock value):
1.) Walsh being followed by an MIB
2.) MIB mistakenly taking part in the interview.
3.) Leventhal reacting to that.
4.) MIB reaching for ear piece.
5.) Leventhal sharing ear-piece frenquency with MIB.
6.) Leventhal pitching lines to MIB
7.) WTC7 dud
I believe the entire reason for that interview was to take place during the collapse of building 7, but ultimately did not coincide.