I'm guessing that since I've worked with Bex in the past we have a method for getting messages annonymously to each other. I just made one up and fluffed it out.
Sending the message: Had a misshap, but most of the work is done. I'll finish it in the morning.
He'll wait a little bit for a response, then get a nights sleep. In the morning he'll take a dose of Psyche and try to disarm the bomb. Though I'm guessing that Bex/Mr. Smith will respond with a faster better than finished type message, and be none too pleased with the data loss.
EDIT: If he either doesn't hear back or gets the all clear to finish in the morning, he'll dismiss Alistair (good sprite but no time to register him right now).