The smoke alarm stops as soon as the wastebasket fire is extinguished, even though smoke continues to rise out of the trash can.
When Robin is looking for the Playbook, it is revealed that moving the arm of Barney's Stormtrooper costume causes the playbook to descend from the roof. However, in Trilogy Time (2012) Robin wears the suit, showing that it's likely not attached to any wiring.
However, it is later revealed Barney orchestrated the events that led Robin to come looking for it, so he likely wired the suit and the secret hatches specifically for that moment. It would not be the first time he has made expensive changes to his apartment to pull off some elaborate scheme.
However, it is later revealed Barney orchestrated the events that led Robin to come looking for it, so he likely wired the suit and the secret hatches specifically for that moment. It would not be the first time he has made expensive changes to his apartment to pull off some elaborate scheme.