[The Squatter of Amon Rûdh]

I doubt that he needed much persuading. I expect that he ensured Túrin's survival in recognition of his promise of weregild for Khîm; he certainly owed nobody else any favours. Ironically enough, this offer of ransom gave Mîm a claim on at least some of the treasures of Nargothrond, which we can assume to have passed to Túrin.