1. Battalion Chief John Norman:
"From there, we looked out at 7 World Trade Center again. You could see smoke, but no visible fire, and some damage to the south face. You couldn’t really see from where we were on the west face of the building, but at the edge of the south face you could see that it was very heavily damaged."
http://www.firehouse.com/terrorist/911/mag.../gz/norman.html
2. Captain Chris Boyle:
Boyle:"...on the north and east side of 7 it didn’t look like there was any damage at all, but then you looked on the south side of 7 there had to be a hole 20 stories tall in the building, with fire on several floors. Debris was falling down on the building and it didn’t look good."
Firehouse: "When you looked at the south side, how close were you to the base of that side?"
Boyle: "I was standing right next to the building, probably right next to it."
Firehouse: "When you had fire on the 20 floors, was it in one window or many?"
Boyle: "There was a huge gaping hole and it was scattered throughout there. It was a huge hole. I would say it was probably about a third of it, right in the middle of it."
http://www.firehouse.com/terrorist/911/mag.../gz/norman.html
3. Battalion Chief Kemly: (second hand report)
"..Captain Varriale told Chief Coloe and myself that 7 World Trade Center was badly damaged on the south side and definitely in danger of collapse. Chief Coloe said we were going to evacuate the collapse zone around 7 World Trade Center, which we did."
http://graphics8.nytimes.com/packages/pdf/...HIC/9110462.PDF
4. Deputy Chief Peter Hayden:
"...also we were pretty sure that 7 World Trade Center would collapse. Early on, we saw a bulge in the southwest corner between floors 10 and 13, and we had put a transit on that and we were pretty sure she was going to collapse. You actually could see there was a visible bulge, it ran up about three floors. It came down about 5 o’clock in the afternoon, but by about 2 o’clock in the afternoon we realized this thing was going to collapse."
http://www.firehouse.com/terrorist/911/mag.../gz/hayden.html
5. Deputy Chief Nick Visconti:
"I don't know how long this was going on, but I remember standing there looking over at building 7 and realizing that a big chunk of the lower floors had been taken out on the Vesey Street side."
http://www.firehouse.com/terrorist/911/mag...z/visconti.html
6. Chief Frank Fellini:
The major concern at that time at that particular location was number Seven, building number seven, which had taken a big hit from the north tower. When it fell, it ripped steel out from between the third and sixth floors across the facade on Vesey Street."
http://graphics8.nytimes.com/packages/pdf/...HIC/9110217.PDF
No matter what their expertise, it is clear that a building that collapses has to follow certain paths of least resistance (at least first) and that not everything collapses evenly everywhere all at once.....except when demolished by placed explosives that remove that resistance.