The scenario is as feared as it is formidable. When leaving a crowded metro train, a shoulder jerk or an awkward gesture and one of the wireless headphones falls, bounces on the platform before ending up on the track near the rails.
What to do in the face of this twist of fate? Give up half of your Christmas present, take the reckless risk of going down to collect it or wait to get help. Reason and the question of benefit/risk must prevail. Obviously, do not risk going down the tracks whose central part is electrified under high voltage.