Ryan glanced through the first page, then closed the folder. "There is one more thing."
"What?"
He looked toward the parking lot beyond the glass doors. "If Douglas forced the schedule this hard, he may have cut more than one corner."
Claire held his gaze. Outside, snow had started falling again.
"Then tomorrow," she said, "we find out how many."
Ryan walked into Whitmore Medical Logistics at six o'clock on Christmas Eve wearing a temporary contractor badge clipped to his coat. Claire noticed it immediately when she met him outside the cold-chain control room. His old employee badge was nowhere in sight, and she did not mention the one still locked in her desk drawer.
Priya Shah was already inside, seated in front of three monitors with her dark hair twisted into a loose knot. Ben Carter stood beside her holding two coffees and a notebook open to a clean page. The notebook had RYAN HANDOFF written across the top in block letters, which Ryan noticed and quietly crossed out.
He wrote SYSTEM HANDOFF instead.
Ben looked at him. "That important?"
"Very. Nobody follows my steps without understanding why. If I leave and this place still depends on me, we failed twice."
Priya almost smiled. "Good morning to you, too."
Ryan set his laptop on the console and reviewed the overnight logs before touching anything. The system had remained stable under normal traffic, which meant exactly what it had meant the day before: almost nothing about the unusual sequence they still needed to test.
"Start with the failover cycle," he told Ben.
Ben blinked. "Me?"
"You asked for cross-training. Here it is."
"I thought I was going to watch you do it first."
"Watching me is not training. Explain the sequence before you run it."
Ben took a breath and began. He described the primary network path, the interruption trigger, the automatic route handoff, the local cache behavior, and the validation points they needed to observe. He missed one timing dependency, caught it when Priya raised an eyebrow, and corrected himself without Ryan doing it for him.
"Run it," Ryan said.
The first cycle failed in the same quiet way it had before. The route switched correctly, but the local cache continued publishing the previous temperature reading.
Ben stared at the monitor. "Three minutes and forty-eight seconds."
Ryan nodded. "Long enough for somebody to trust the wrong screen. Now tell me why."
"Because the dashboard is reading from the local cache instead of confirming source freshness after the handoff."
"Closer. What assumption is the system making?"
Ben studied the event log. "That a successful route switch means the data source changed at the same time."
"Exactly. One event is being treated as proof of another."
Claire stood several feet behind them. She had expected Ryan to take command by doing what he did faster than anyone else. Instead he slowed the room down, forcing Ben to articulate each decision so that knowledge transferred rather than merely producing an answer.
At 7:45, Claire returned to her office and called the hospital network's operations director, Martin Hale. She had rehearsed several versions of the conversation on the elevator and discarded all of them when he answered.
"Martin, we are not going live tomorrow."
Silence.
Claire continued. "Validation is still in progress. We reproduced an unresolved failover behavior, and I will not authorize production until it passes acceptance criteria. Earliest possible launch is December twenty-sixth, and only if the system validates."