It's playing jazz music and a Jack Ryder news report.
Use the reflection of a reversed question mark part and make it join up with its respective dot.
Heading north along this platform and crawling under the broken part, Batman will arrive at the site of a hidden question mark.
You can spot it eassier in Detective Mode.
Land on there then activate electromagnet with the REC.
If timed properly, the riddler cage below will open up.
Hop up onto the vent and drop into the cage with the Riddler Trophy to snag it.
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Here is your free PS3 walkthroughs of the different levels of the game, how to finish the riddles in each area, and how to get the achievements that it holds.
You can find some of these tricky teeth in the south end of the Transfer Loop and in the halls north of Decontamination.
Batman must use the Explosive Gel on the breakable wall in the main area of the Patient Pacification Chamber and then scan Maxie Zeus 's cell to solve this riddle.