Coruscant underworld
Serenity stops bobbing her head when she gets the added hacked message. She looks around, spots Gib, and just as she is putting two and two together, Nathan hobbles in covered in blood. She takes her headphones off and they rest around her neck.
Serenity says, "I'm a doctor. Lemme have a look at that arm." She goes to check on the arm, regardless of Nathan's response. But in her experience, most people just take her word for it because they want a doctor to be there.
Those few who didn't, she just knocked their lights out, fixed them up and then left them there with a note that said, "You're welcome. Next time, let the doc help you and you won't get punched in the face. Have a nice day. :)"
She isn't ignoring Gib. Just that someone with a wound barely able to walk shows up kind of takes priority.