‘I’m no demon! I’m a human!’ he said, and stop…

‘I’m no demon! I’m a human!’ he said, and stopped in shock as his words emerged in perfect Klatch.
‘You’re a thief?’ said the father. ‘A murderer? To creep in thus, are you a tax-gatherer?’ His hand slipped under the table and came up holding a meat cleaver honed to paper thinness. His wife screamed and dropped the plate and clutched the youngest children to her.
Mort watched the blade weave through the air, and gave in.
‘I bring you greetings from the uttermost circles of hell,’ he hazarded.
The change was remarkable. The cleaver was lowered and the family broke into broad smiles.
‘There is much luck to us if a demon visits,’ beamed the father.