M-Bot's responses mostly come in the form of differently-pattered chirps - negative or 'not that' sounds like downward-trailing tones, yesses or 'go back to that!' are a cheerful-sounding tri-tone.

Some of these, even M-Bot can carry. But at some point in the process it zips off and returns with... something that could pass for a metal container.

It may be one of the raiders' heads.