Following are a number of back-translations as well as a sample translation for translators of Joel 2:30:

• Kupsabiny: “I will make amazing things happen
  up here in the sky and down there on the ground/earth.
  Blood will pour,
  fire will come and the world/earth will emit smoke.” (Source: Kupsabiny Back Translation)
• Newari: “And I will work wonders
  in the sky and on the earth.
  There will be blood, fire and clouds of smoke.” (Source: Newari Back Translation)
• Hiligaynon: “I will-show miracles in heaven and on earth: Blood, fire and thick smoke will-be-seen.” (Source: Hiligaynon Back Translation)
• Kankanaey: “Later indeed (predictive formula) I will show amazing-things in heaven and on the earth. Blood, fire and fearful smoke will-be-seen in-the-future.” (Source: Kankanaey Back Translation)