It’s not easy to evacuate or escape from the scene of a fire in high-rise building.
And it's hard to use escape equipments those are equipped the building, because people are embarrassed when a fire breaks out.
They will be left defenseless in high-rise building if there is no outside help.
In addition, if a fire breaks out the high-rise building, people try to escape through windows to avoid flame or smoke, and it directly leads to loss of human lives.