Batman: Return to Arkham Asylum out of bounds easter egg

How to view the out of bounds discovery: Go to the location in the video and enter corner cover in the spot shown. A glitch known as storage will need to be performed. Select Explosive gel. Detonate the gel and quickfire batarang (you don't need to have gel sprayed). If performed right, Batman will be holding the explosive gel without you holding anything. Change your gadget to anything else besides the Batarang and Explosive gel. Go to the area with the TV and crouch beneath it. Walk back as far as possible and re-equip the explosive gel. Aim towards the vent or fire shown. While still aiming, equip the batarang. The storage glitch is Batman storing the previously entered cover, so he will attempt to enter cover and end up zipping away. If performed as shown in the video Batman will zip into a wall that will allow him to see out of bounds and view the easter egg. I believe this should work on the Original Batman Arkham Asylum. I have also used console commands on the PC version to go to the easter egg in another video.