Who would win in a fight, Jack Reacher or John Wick? But thanks to "Reacher" Season 4, we do know who would win in a battle of who can deliver the most brutal kill in a library. "Reacher" Season 4 is based on the Lee Child book with the most bonkers reveal, "Gone Tomorrow." Thankfully, showrunner Nick Santora and his team have inserted multiple action sequences into proceedings already, including a library fight that sees Reacher face off against a knife-wielding thug in a fight that feels very reminiscent of a scene from 2019's "John Wick: Chapter 3 — Parabellum." The "Reacher" version, however, is even more brutal than its predecessor, which is saying something considering the "John Wick" fight culminates in Keanu Reeves slamming a book into his attacker's esophagus.