Many ways to do this quest without violence, matter of fact alot of chapter one can be done without violence. Enemies become allies ,ect. That why I have replayed three times already and will do so again!
SPOILERS
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HA! I convinced (persuaded) him she would never get as tall as him as he let her go.
My Brother told me he had the dwarf girl slip some nasty powder in his food and Rumgut let her go because he thought she couldn't cook.