"And Pull also means to get people out of a dangerous situation, such as a burning building about to collapse."

Uh, excuse me, but you just got onto my turf. Pull is NOT used by firefighters when there is a general order to evacuate a building. What happens is three sirens AND an order over the radio to evacuate immediately. (That is signaled by the speaker saying, "Emergency traffic, emergency traffic, emergency traffic". It's used to clear everyone off the radio net (keep them silent) until the emergent situation is transmitted.) The causes of an order like that are usually imminent danger of structure collapse or imminent danger of explosion or flashover.