I just realized the significance of this scene. It’s his list (Courtney, Montgomery, Bryce, Justin, Sherri, Marcus, and Clay) of reasons why. Hannah took everyone reputations down with her. Tyler is planning to take everyones life down with his.
They put the possibility that it could have been Tyler who shot Alex instead of dying of suicide, but that’s the whole premise of the series. You’re attention is focused on something else that you missed the signs. Everyone was focused on Hannah that they may have missed all the signs that were present for Alex. Everyone in the next season (hopefully) will be focused on Alex and the trial that they don’t realize a possible school shooting is headed their way. Like Hannah said, her reasons why had a butterfly effect.
Avatar The Last Airbender - Koi Fish Spirits - “Tui & La” [in Chinese:
推 & 拉. Tui means: Push. - La means: Pull.]
Thousands of years before the Hundred Year War, Tui and La decided to manifest themselves in the physical world to benefit mankind, taking up residence in an alcove in the Northern Water Tribe’s capital city. They created the oasis in the North Pole and took the form of two koi fish. Thus the Spirit Oasis in the city became its most treasured landmark.