But while Stahelski and his team have obviously put a great deal of thought into every frame of fisticuffs, “Parabellum” is so relentless that it often devolves into a numbing flurry of shoulder flips and headshots. If “Chapter 2” bordered on high art for how cleverly it weaved tactical shootouts into public locations (and made every fight operate like an organic bit of world-building), “Chapter 3” is more out in the open. A sneaky little skirmish in Grand Central Station doesn’t live up to Stahelski’s creative potential, even if it’s amazing they pulled off the scene at all.