Ada's grapple gun

Ada has it from Ada Chapter 1; used at marked points.

Ada climbs to ledges and crosses gaps with it; she also rides zip-lines.

Agent has no grapple: when Ada uses it, Agent vanishes and reappears next to her once she lands. He also can't open doors, pick up key items, flip switches or use zip-lines.

Ada Chapter 3, bus roof against the Ubistvo: Ada dodges by grappling to the other end; Agent has to slide or roll between its swings to the opposite side.

In split-screen, Ada is always player 1: the grapple and every interaction are hers; Agent provides the covering fire.