Thanks!
However now I met the Flaming Fist attack teams, which are death squads plain and simple.
They spawn a group with battle mages, soldiers that apply oil of speed and thieves that quaff potions of invisibilty.
Maybe you´d stand a chance towards the end of BG1 but then again they just keep coming and coming...
At the very least there should be an end to the attacks if you killed a few waves.
For now I think the only thing to do is cheat up my reputation with Shadow Keeper
Low reputation = game kills you off.
One aspect of the game I never realized cause I always avoided such low rep, however this time I just "went with it" instead of save scumming. Big mistake.