Sara found out Nick got the promo- from Nick(!). And when she confronted Grissom and asked him why she didn´t get it Grissom didn´t even bother to look at her or tell her the real reason.
[INT. CSI - GARAGE - NIGHT]
(GRISSOM and SARA are going over SAM BRAUN'S limo, Nevada license # 225-THG.)
(Camera moves around the limo and we see GRISSOM walking along the length of the
limo, pulling the tape measure that SARA'S holding down at the other end.)
(As he measures the distance between the tires, SARA looks up at the side of the limo.)
SARA: Nick said the budget for the promotion was cut.
GRISSOM: 240 inches-- 20 feet.
SARA: He also said you recommended him.
(SARA lets go of the tape measure. It slides along the length of the limo and snaps back in front of GRISSOM. He looks at her.)
GRISSOM: I did.
(Cut to: [INSIDE THE LIMO])
(They both sit on the side seat. SARA sprays the back of the limo as GRISSOM sprays the front.)
SARA: You said you didn't have a problem with me.
GRISSOM: I don't. (They continue to spray the seats.)
GRISSOM: I thought Nick was the best candidate for the position.
SARA: Why?
GRISSOM: Because he didn't care whether he got the job or not.
(SARA stops spraying.)
SARA: That's a stupid reason.
(They resume spraying. GRISSOM finds something on the back seat.)