Zlam and Bruce materialize almost immediately, apparently in the middle of the doctor having something of a freakout and the engineer attempting to calm him. Registering their sudden change in surroundings seems to momentarily bring a pause to that interaction, and when the door chime rings, Cass thinks, amazingly, Darcy. Thank god.
"Come," she says. When Darcy is inside, she says, "I'm glad you're here. We seem to have some confusion about the meanings of 'medical leave of absence' and 'confined to quarters.' Let's get that all sorted out right now, shall we?"
For the first time, Cass allows herself to really look at Zlam, but she ruthlessly sidesteps the emotional response to seeing him so unexpectedly vibrant. She does modify her tone to be slightly less authoritarian as she says, "Dr. Zlam, it's very good to see you. We've all been very worried. But you are not authorized to be outside of sickbay. And you," she says, turning to Bruce, "aren't authorized to be anywhere other than your quarters. When I sent you to sickbay earlier, it was a one-time-only emergency exemption, not a get out of jail free card to use at your will."