The Amazing Spider-Man Walkthrough Part 7 – In the Shadow of Evils Past, Part 2
Head into the ventilation shaft that you just cleared. Just move forward and you will land on the elevator transporting the files that are marked for immediate destruction. Spider-Man will assess the whole situation, which includes noting a shutterbug in an Oscorp disguise. Turn around and look up, you will find another Ventilation Shaft to get into. Follow it to the end and you have 2 guards below you talking about how so many have gotten sick in Ostower. Mix in a Web Retreat and you can easily get Stealth Takedowns on both of those guards.
With the guards dealt with, head over to the right. Just to the right of the door there, on the floor, is a piece of Oscorp Security Material. Grab it then start scaling the wall to get into Ventilation Shaft above you. Head through the duct and then dash over to the next. The guards below comment on having a good view of the other slacking off. Head through the next air duct to collect some Audio evidence on Oscorp.
On the other side of the air duct, you will emerge above a Security Officer. Use the Stealth Takedown, Web Retreat combo to avoid detection. With some creeping along the walls, you can get at least one more Stealth Takedown before entering into the brawl with the remaining guards. With good hiding skills (ducking into the air vents for a minute) you can easily take out both patrolling guards. There are 7 total on the floor below.
With them all down, head over to the left and through the large hole in the boxes. Be sure to get up the walls or ceiling quickly. There are 9 guards in this room to be dealt with. There are no real good options for stealth overall. Still, a takedown and retreat pattern makes it a lot easier to tackle all of the guards.
Once they are all down, head for the back walkway, nearby the short stack of crates. On the far right end you will find a tech upgrade worth 30 pieces. Now head to the far end of the room where you see a glass window you will be breaking shortly. To the left of the forklift, between the crates, there is a magazine for you to collect. After that, hold the prompted button to look at the suspended crate. Interact with it to get it to slam into the glass above you to open the path forward.
When in the walkway, look to the right. You will find a ventilation shaft to crawl through again. Follow this one to the end to find Whitney Chang, a reporter. Do note that to the right of the door into the room Spider-Man launches Whitney into there is a collectible comic page. Once she is away, time to face off against the Oscorp shield guard. Hit the prompted buttons to learn above the leap over and attacking during it. Pummel him some with that technique then just focus on brawling to finish him off.
Whitney will want to investigate further and head deeper in. Head forward through the maintenance access tunnel. As Spider-Man turns the corner he steps into a security grid. He will jump back and around the corner. Head just a little out and fire your webshooters at the turret above. Once it is coated in webbing, then interact with it to destroy it and be clinging to the ceiling.