"Optimal bacta treatment protocol calls for continuous immersion," Yara answers the question in a crisp professional tone. "We haven't needed the tank for other emergencies, so he's been undisturbed. It's good you're here, actually--patients who were unconscious going in are sometimes disoriented coming out. I like to have someone familiar in the room if possible."
She punches a button, and a gurgling sound comes from the tank as the thick bluish-clear fluid begins to drain away through a series of filters and into the reserve chamber. The harness still holds the Boss upright, even though gravity exerts a stronger and stronger effect on him as the bacta level drops. He might begin to wake up now, as the machinery injects him with a mild antagonist to counter the last of the sedation.
"I have the impression you're no friends of the Empire," she says over her shoulder to the jumpy guy, while she waits for the fluid level to fall low enough that she can safely crack the tank seals.