When Tyler Browne comes back to Opportunity High he brings something unexpected. A gun, and with it all the memories of what he has done to many of these people. All the students and staff are kept hostage in the auditorium in an attempt for revenge. He is determined and won't let anything, or anyone, get in his way. But Autumn, his sister, and Sylv, her girlfriend, gets trapped in the auditorium too.
Meanwhile, Tomas and Fareed hear gunshots while they break into Principal Trenton’s office to steal a look at Tyler Browne’s records. Once they realize what is going they call 911 in hopes of getting help and are told to get out of the school while they still can. Instead of listening they try to help students that haven't been injured yet get out of the auditorium.
The shooting happens while Claire is safe outside at track practice. When she and Chris figure out what's is going on inside of the school their track coach attempts to find a phone and calls the police while they run and try to get to the police in case he can't find one.
Fareed and Tomas find a way to open the auditorium doors and get people out of harms way. They crawl around tapping on peoples shoulders and telling them that the doors were open.
Tyler notices people getting out the doors and starts yelling. He never said they could leave so all of this is just for power at this point.
Tyler sees Sylv, Autumn, Fareed, and Tomas leaving the auditorium he chases after them. Now all he cares about is killing them. The SWAT teams and police are able to come in and rescue everyone still in the auditorium.