I'm not experienced by any account but:
'If we have a fire here is the extinguisher and I'll follow the checklist. This could mean shutting the engine down temporarily or landing in a field as I described just now.'
Referring to a document however authoritative or not provides the perception that there is a tried and tested plan in place and the pilot has thought about it. It's worked when I flew a mildly nervous passenger not too long ago.