The train just got packed.
07:48 · standing · earphones in · podcast playing
Without context-aware AI
The phone is mid-podcast in your hand when the carriage fills. You can't operate it. The screen stays on, draining battery, glaring at the person beside you. To skip an ad you'd need both hands and a wider stance you don't have.
With Context Grammar
Phone proposes a handoff: "Switch to wrist + earphone control?" One tap and the phone goes dark in your pocket. The watch picks up skip / back. The podcast keeps playing.