Mal walks into Shuttle One
from the cargo bay and it takes Inara less than a second to question him. 'What is it?' she asks, because anything that makes Mal slide the shuttle hatch closed with as much useless force as he just did (one of the joys of pressurized doors -- no slamming), something must have happened.
Mal recounts the conversation from downstairs with
Simon and Kaylee in a rush. After he finishes, complete with several 'What the hell was I supposed to say? Ain't like I can stop 'em' and a reinstituted habit of pacing, there's not much left to do except stare at Inara and wait for a reaction.