The change in demeanor could be anything. Devin tends towards suspicion, but he's also fully aware that trauma is difficult to talk about at the best of times. If the two women are concealing anything, it could just as easily be that their experience is too distressing to repeat as intentional evasion. He doesn't have nearly enough information to give credence to the latter.

"I doubt we will any time soon," Devin replies just as quietly. "They're not likely to allow members of the general public to speak with the crew for quite a while." He nods to the pair. "We ought to let you rest and recover, even if it may mean we won't get the chance to talk again. It may help if you write things down," Devin suggests. "The Sentry will want an account of what happened, and I've found writing is often easier than having to speak about it."