Chapter four starts with the conversation with Chloe. After a short while, her leg will get stuck in the railroad tracks. Your task is to find a way out of this critical situation as soon as possible. Naturally, you can use your time-manipulation abilities here. Get on the elevation beside Chloe - you will find a crowbar next to hut. Approach the wiring, extract a brick blocking the whole thing with the crowbar (Crowbar - Use) and push the whole thing on the railroad tracks. Afterwards, run all the way back to Chloe and help her get out. If you run out of time during all those things (which will surely happen), you must use your abilities and go back in time to try to rescue Chloe one more time.
After you've done it, you will go back to school - you can head to classes now. Before you enter the corridor, approach the girl that is distributing leaflets and try to sign up on an event. The girl will refuse, so in order to get a positive entry to your journal you will have to convince her to change her mind. Rewind the time and start the conversation again - you will now have access to a new dialogue option (Dress Code?).
Before entering the main hall, you can take your time to look around the area and speak with the principal, as well as the guard. Unfortunately, you won't learn about anything useful, so you can just go straight to your class. While going through the hall, you will get a text massage from Warren. Head towards science class to speak with him.
Warren will ask for your help with mixing some chemicals. Regardless of your choices (sodium, or potassium), the game won't note it in your journal as help. To get such an entry, you will have to rewind the time, approach the teacher and ask her about the experiment. She will tell you that the best one to use is chlorine. Get back to Warren and start the conversation again. During it, a third dialogue option will appear (Chlorine). Afterwards, the experiment that Warren conducts will be successful, and you will be able to take the last photo for your collection. Additionally, you will get a journal entry about helping Warren.
Leave the class now and head towards Jefferson. You can speak with him about Kate and then head to your desk. Before you sit down, however, get closer to Alyssa and take a photo of her back. After you take place at your desk, you will be able to draw on a blank sheet of paper and look around the area. After a short while, one of the students will charge into the class with shocking news and the whole class will follow him into the dorm.