The following page of the Marvel's Spider-Man game guide contains the walkthrough of the "Straw, Meet Camel" mission. Peter has to save Fisk's people, as they fall prey to a new power within the city - the Demon Gang.
You will begin the mission in a construction area of ??a skyscraper. You have not been detected yet - try to eliminate some of the criminals silently. When you clear the building, keep going and you will come across a group of gangsters. Stay alert, as the enemies are fighting with weapons full of evil energy that deals a lot of damage. The best tactic is to frequently dodge and counterattack when possible.
After defeating the enemies, Peter will contact the Kingpin. The man will share valuable information provided that you help him save his people. On the map, you will find a few points full of armed enemies. There are a lot of fights ahead of you - try to push some of the opponents off of the roof to make it easier for you to win.
At some point a Demon Brute will also appear - this enemy is extremely powerful. It is definitely worth using your gadgets to prevent him from getting a chance to attack. After winning the clash, a few more ruffians will be waiting for you.
Now head to the top of the building - here you will see an interesting cutscene. You must press the appropriate buttons to keep the scaffolding together and continue your pursuit of the helicopter. Chase your target, and simultaneously be wary of the rockets that will be fired at you. In the end, you will get close enough to press the triangle button and attach your web to the load.
You will land inside a building. Press R2 and run forward. Press the triangle button and enter the vehicle. You have manoeuvre around both sides of the helicopter and push the square button in order to destroy its engines. In the meantime, watch out for the attacks of the Demon Gang members.
The mission ends with a few quick time events - press the buttons that appear on the screen. Peter will stop the helicopter in a spectacular fashion. The mission will end in success and you will gain 2,500 XP.