a third of mankind was killed
The terrible slaughter will completely disrupt human society. The problem of disposing of the dead bodies alone will be inconceivable. The sickly stench of decaying corpses will permeate the world, and it will take an enormous effort on the part of the survivors to bury them in mass graves or burn them.1 See commentary on Revelation 9:15.
1 John MacArthur, Revelation 1-11 : The MacArthur New Testament Commentary (Chicago, IL: Moody Press, 1999), Rev. 9:15.