In Batman Arkham Asylum what happens to Riddler when you beat the game

When you've solved all of Riddler's riddles, collected all the Riddler Trophies, destroyed all Joker Teeth, collected all the Patiend Interview Tapes, and found and scanned all "Chronicles of Arkham" tablets, here's what happens:
The Riddler will communicate with you and fuss about how that there's no way that you could have solved all his puzzles, then you'll hear police sirens approaching the Riddler's hideout. The police will break into the hideout and arrest Riddler.
Fortunately, you'll be able to hear the whole thing happen