Sly, you'd better be on your guard here. My paranormal scanners show this place is really haunted!
― Bentley warning Sly about the dangers that await[src]
Bentley contacted Sly to warn him about how haunted the area was, as indicated by his paranormal scanners. As Sly pressed forward, he came across a gravestone that was continuously spawning ghost rats. Upon smashing it, the ghosts stopped appearing all of a sudden, leaving Bentley to believe it was some sort of ghost generator. By smashing them all, Sly would be able to make it through safely.
Okay. Okay, this is kind of a guess, but try 1-2-8.