They're still back at the building.

[He starts talking before he even makes it to Nathaniel, stopping to pull in a few quick breaths when he finally does.]

We found people. Bodies. All in different stages of decomposition, but they all look to have died of some kind of plague. Zulf-san seemed to recognize the symptoms. He was adamant that I come find you.

If there's sickness here, we need to leave.