You will be on the train again. You need to run from car to car in a given amount of time. Leap from the train into the tunnels. You can get a few items by talking to guys along your way, and one guy will take something, but by talking to him you can take that item back. Hurry along through the cars and you will get to the walkway. You will find a small hole leading to Area 5. Go in and be ready for battle. The enemies here are a little stronger than before. Battle all of the monsters and get to the reactor. A flashback will hit Cloud. Plant the bomb, and follow Tifa into the controls center. You have to push a button at the same time as Barrett. Keep trying this until you can do it, because you have unlimited time. It will open a gate which you need to enter. You are surrounded by guards on a bridge, and you meet the president of Shinra. You will have to fight a boss now.After beating Air Buster, Cloud falls unto a ledge and falls into the city below. Barret and Tifa escape. When Cloud wakes up, he is in Aerith's church where she is growing flowers.
