Video game designers often rhapsodize about Core Loops, those small, quickly repeatable moments of coolness that can keep players glued to the controller past the point of thumb-trauma. 2014’s John Wick made this phenomenon into a spectator sport, devising a seemingly infinite (and distressingly satisfying) variety of ways for Keanu Reeves to inflict grievous bodily harm on a steady stream of henchmen. John Wick: Chapter 2 somehow managed to further refine the formula, ramping up the action scenes to the verge of head-popping nirvana, while also adding new wrinkles to the agreeably odd surrounding mythology. (This is a universe in which literally Every Second Person You See is an assassin.) They were both just about perfect, in a Red Meat/Reptile Brain way.