Officers Jack and Exley visit Leonard in L.A Confidential (1997), who is working out on a speed bag. They ask for his help in identifying suspects. Leonard agrees when Jack offers to reduce his brother’s sentence. Leonard provides information about Sugar Ray Collins, who drives a maroon '49 coupe and enjoys killing dogs. Jack thanks Leonard and notes the location is nearby:
Leonard: So I'll hear from you, right? About my brother?
Jack: Keep it up, Lenny. Up.
Then Jack and Exley get in the car and leave.
Here Jack did not directly answer Leonard's question. Instead, he responded with the phrase "Keep it up, Lenny. Up."
Why didn't Jack answer Leonard's question?