Not moving while staring with 〜ながら
Grammar Explanation: Concurrent events with 〜ながら

Chino notices that Cocoa has been motionlessly staring at a puzzle piece.
- チノ:
- 「ココアさんさっきからピース見つめながら動
( かない…」- “Cocoa-san has been staring at the puzzle piece while not moving for a while now...”