This is a good video on operating a typical elevator. I understand that there are many different types of elevators and different operating methods, but most are very similar to this. You can have different types of keys but the systems should be pretty standard.
That night 77 people lost their lives at a school event that should have ended with celebration and refreshments. Instead the community was tasked with finding the bodies of those who did not make it out.
Basically, the way that these pillows work is that when they are heated, they expand (the plastic will melt away) and fill the void. This maintains the fire rating and prevents fire from spreading and smoke spread is contained.
Steel will deform and twist and this beam will meet little, if any, resistance during a fire. I understand that a pocket of concrete will not keep this beam from dislodging, but it there is a reason for properly pocketing these beams.