Destroying the third camera | 4: Under Watch DMC: Devil May Cry Guide
Last update: 11 May 2016
BONUS MISSION: Stay on the shelf from which you've destroyed the second camera. Turn to see far Secret Door. Make a double jump with Angel Boost. After reaching the shelf with door you have to use also angelic Pull. If you have an Argent Key, you can begin a bonus Flawless Conquest (2nd screen). You can't be hit in this mission. I suggest to begin from eliminating those flying monsters. Then finish off Ravagers, watching out for their charges. At the very end take care about two Frozen Knights, avoiding their wave of cold.
Jump down and locate a left alley shown on the screen. You meet Kat and watch a cut scene with her.
Begin from using Demon Pull where you've been talking with Kat. Now travel through upper platforms, using demonic Pull on once Angel Boost on your way. Your target is a shown on the screen roof.
Begin exploration from a double jump heading for a Lost Soul. Then return on the roof and use the Arbiter to destroy a barricade. Enter a small room where you find eighth Lost Soul.
Again return on the roof and jump down on its lower part. Place yourself where the screen shows and use a demonic Pull to destroy the last camera.
Just after that you'll be forced into a new battle. I recommend to begin from eliminating all flying monsters (screen above) and only then jump down to finish of remaining ones.