what does "summoned" mean? I am little confused .how to close that gate? is the gate here "door"?
Still, a parade was a parade. Fifteen minutes before noon the men used both of the buildings antiquated elevators to go down to the street level. As they passed the fifth floor, Charles Givens, a thirty-eight-year-old former Navy steward and senior Book Depository employee, saw Lee Oswald standing by the gate on the fifth floor, watching them go. Their departure left the top stories unoccupied. In effect, the upper part of the warehouse had now met the Secret Service's definition of the classic sniper's perch—it was a deserted building.I think "summon" means "close" in this context, am I right?