In the opening minutes of Arrow’s final episode, the show shifted gears back to a pivotal moment that changed the series forever.
Thus, restoring his mother’s life, and arguably giving fans some “wish fulfillment” in the process.
Back in Season 2, Episode 20, Slade murdered Moira in front of a bound Oliver by impaling her with his sword. In Arrow’s finale, Oliver was able to save Moira’s life by getting to Slade before he could commit the heinous crime.