The receptionist tells Olivia that courier Mike rode up with him. Which one's Mike, Olivia wants to know, and the receptionist points out the guy who looks ready to shit his pants any minute -- only he's gone.

He's in the bathroom, splashing water on his face ... and then droplets of blood in the sink make him look in the mirror and see the trickle of blood running from his nostril.

Outside, Broyles strolls over to Astrid and Walter and tells them about the dead guy from the Netherlands who walked into the building at 7:30 this morning, and his veins ruptured. That was at 7:30 in the morning? Busy office! Walter theorizes vasculitis, or an arteriovenous fistula, which is an abnormal channel between the vessels resulting in swelling of the veins. "Until they rupture?" asks Astrid. No, not usually, admits Walter. "But then that's why we're here, I imagine," he adds, as they walk towards the doors of the building, just as a very sick-looking bike courier tries to get out. Walter instinctively holds the door shut upon seeing the man's face just as the veins start to rupture, and the courier spews blood all over the other side of the clear glass doors, which you'd think might be gross, but I did spend a year in residence at university.

Walter's excitement over the case has completely darkened. "This building must be quarantined immediately. No one goes in or out. I believe we have a contagion on our hands," he says. Just then, Olivia and Peter come down the stairs. For anyone who doesn't understand what quarantine or "no one goes in or out" means, Astrid says Olivia and Peter will be trapped inside. Walter looks like he'd like to change his mind, but repeats the instruction to quarantine.

After the commercial break, a frantic Walter is on the phone with Peter, trying to find out more information about the dead Dutchman: "If I can find out where he came from, where he was, then I could begin to ascertain what could have infected him." Peter says they don't know, and Walter says the guy must have been coming to see someone there. Then Walter notices the CDC arrive. This does not seem to be good news to him.

While Astrid tries to console Walter outside, Vincent Ames is starting to get a little irritated with the quarantine, and then some of the other office folks are asking about Mike. Olivia confirms that Mike is dead, and then a bunch of them start bickering over who got the dead guy's blood on them, and then they notice the office airflow has been shut down, which Olivia says is protocol in case the virus is airborne. Then she says she wants everyone to divide into two groups: one that was near VandenKemp, one that wasn't. Nobody moves particularly quickly, and then Peter grumpily snaps at them to get a move on.