silverstien was talking about something when he said pull it and it wasn't "to evacuate the firemen".
"Pull it" refers to pulling out the contingent of firefighters out of the area. How do we know this? Because Silverstein said that's what he meant. Who else used the term "pull" that day? Let's see:
"I issued the orders to pull back the firefighters and define the collapse zone." FDNY Chief of Operations Daniel Nigro
I do remember us being pulled off the pile. ...We were down by the pile to search or looking around." Firefighter Kevin Howe
"We started to pull guys back because we were concerned for their safety. " Deputy Chief Peter Hayden
"There was a big discussion going on at that point about pulling all of our units out of 7 World Trade Center." Deputy Chief Peter Hayden
"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 . . it was hitting the sidewalk across the street, but eventually they pulled back too." Chris Boyle
"They pulled everybody out of there. ...that was probably like four or five o'clock before we stopped." Firefighter Todd Fredrickson
"One of the chiefs pulled us all out because they said 7 was going to come down." Firefighter Kevin Quinn
"At that point, Seven World Trade had 12 stories of fire in it. They were afraid it was going to collapse on us, so they pulled everybody out. We couldn't do anything." Firefighter Maureen McArdle-Schulman