Cass checks to make sure no one else is near enough to hear, then says very quietly to Marbo, "I think there's something going on on those pirate ships, some kind of sickness. The captain who tried to order me to accept a boarding party looked like these people - no pigment, sweating, unwell. Hortam said that some of the pirates were in vac suits, so I'm thinking maybe they were trying to avoid contamination. Look for ANY sign that this whatever it is might be communicable, but keep it to yourself. We can't afford a panic right now."
Then she leaves Marbo and strides toward Kendall. To the nurse, she says, "The civilian is with me. As you were, lieutenant," then taps Kendall's arm to get her to walk with her toward the injured security officer.
"Yang," she says, "welcome back. I'm sure this isn't the scene you were expecting to return to." Cass gives a small, ironic smile. "I need you to tell me everything you saw on that pirate ship. If we're going to piece together what's going on, we have to have a complete a picture as possible. No detail is too small to matter."