HVAC fag here
Saw the bs about laughing gas being used to disable the guards through the ventilation system.
Have worked on commercial ventilation system. Have my EPA certificate with all three types (universal) can work on skyscrapers. Sometimes you get a call for a unit not working and it turns out to be a fucking breaker or something so stupid and simple.
The theory of the laughing gas is in this category. They had a power outage or black out. Guess what it means ?
NO ELECTRICITY YOU MORON
How does the ventilation system work with no power. If they blacked it out they also disabled the back up generator.