Following are a number of back-translations as well as a sample translation for translators of Jeremiah 50:29:

• Kupsabiny: “Tell the people of arrows
  those who know to bend/stretch the bows
  to open/begin fighting in Babylon.
  Tell them to come and surround the city
  and guard (it) so not even one person escapes.
  This city deserves to be paid back for what it did.
  Yes, it should be done to it also like it did to others,
  because it defied me God,
  who is the Exalted one of Israel.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “‘[You (plur.)] summon the archers to attack Babilonia! [You (plur.)] surround it so that no one can-escape. [You (plur.)] repay her of what she has-done; do to her what she did to others, for she fought-against the LORD, the Holy God of Israel.” (Source: Hiligaynon Back Translation)