Blue

Blue was investigating White's body (the first crew member to die), and to do so, she had to scan all the crew members. Blue had scanned Blackberry, Cyan, Green, Black, Yellow, Brown, Orange, and Red. Only one was missing: Lime.

Azul approaches the sewer, since Lima is an engineer and spends most of his time there.

AZUL: “Looks like I’ll have to look a straight gambler in the eye!” —He says in a slightly louder tone of voice, to get Lima’s attention.

Once Lima appears, Azul reacts.

BLUE: “Well, how about we scan you?”

Azul realizes that Lima is not cooperating, but she wasn't going to use violence or anything like that, but rather her natural charm to convince him.