helm.inputBinding — the 'Helm' control. The one verb of the game, so it is the first and largest thing a thumb finds on a phone. Q is the primary key and H the mnemonic beside it; Shift belongs to `sprint`, which is where a player's hand already goes for speed and where the humanoid's controller reads it by name. Every device class is bound. A control missing one is refused at activation, naming the class it lacks.