After having consumed the Warden, Gary looked back at what he had done for a moment. In reality, the Warden was just doing her job; her place here was to stop the prisoners from escaping.
To her, Gary was a criminal whether or not he had been wrongly placed here. Certainly, he had seen his fair share of people who deserved to be in the prison. Yet, he had to take the Warden's life for two reasons.
One, that at any cost she did what she could to stop him from getting out of the prison, because he was a criminal. The second… although he didn’t want to admit it, part of him needed the power he would gain.
From his experience of being put into the prison in the first place through the powers of the Phoenix Gang, Gary knew he had to get stronger. The power of one of the Kings was beyond what he had expected.