I don't know if this will help but I cheated to that level killed him for you and saved it, theres no escapees and you will have to redo Bonewerks and Slig barracks unfortuantly.
EDIT: I have added a save game that will allow you to pass to Soulstorm Brewery, without having to redo the previous levels.
FDP11C08: Will have to redo other levels | Possible good ending.
FDP102C09: Can carry on to Soulstorm Brewery | Possible bad ending