Bug reports.

This is not a bug. When the AI controlling a human unit (during an auto-battle or with an uncontrolled ballista) decides it’s time to retreat, it suggests this to the player. When using Blind or Berserk, keep in mind that even an uncontrolled ballista can allow the enemy to escape (it depends on luck: whether the AI deems it’s time to retreat or not). After agreeing to retreat, there might be another message offering to bribe the enemy instead of retreating, but this happens much less frequently.