Squads cannot drop or directly give away stairwell keys, even when holding extras.
The final-phase announcement states that a key remains bound to its squad until used or won. A holder may not voluntarily drop it or transfer it to another squad under any circumstances.
To relinquish a key, the holder must initiate a card battle and use Flee, which randomly transfers one held key to the opponent. This forces every act of cooperation into a formal combat structure and introduces risk when multiple keys or opponents are involved.
A golden stairwell key locked to a squad emblem with drop and handoff symbols crossed out.
The restriction prevents peaceful redistribution and ensures keys can change hands only through spectacle framed as battle.