I was mostly thinking about shootings, although they historically haven't been coupled with bombings. There have been many cases of suicide bombers aiming for a crowded area of people to detonate in, and major terrorist attacks have often been multi staged, synchronized plans.
The only thing constant about successful (not sure if that is the word to use in this case) attacks is that the attack methods have always changed. That said, the smoke out tactic is nothing new. It was also a fairly common Mafia tactic in the prohibition era. Two part hit and run. They would send a person ahead to light a fire in a rival gang building. Then a second party would do a drive by when the target is evacuating. Technically, it has been used for thousands of years though.
Also, When nuclear fallout was the major worry, the last thing they would want you to do was to go outside. Today, that is still a possible scenario, although it is more likely to be from dirty bombs.