Leaving the Mystery Behind is one of three possible endings for Cindy Lennox in the "Flashback" scenario of Resident Evil Outbreak File #2. This scene occurs if Cindy goes through the abandoned hospital and escapes without defeating Al Lester.
With the Monster Plant killed, the abandoned hospital begins to collapse. Cindy Lennox reflects on her experience, there.
Cindy Lennox: "The sound of the landslide was swallowed up by the fog. All living things eventually die. The hospital itself was no different."
Cindy Lennox: 崩壊の音はいつか霧に飲まれ再び森を静けさが覆う