My guess is it’s mounted to the front or underside of the seat. So more or less.
And this is why I don’t get too worked up about wearing a helmet when I ride my bike - head injury statistics include people who do this kind of thing, as well as those who zoom around in a tight peloton at 45 km/h on 3 kg of carbon fibre that cost more than a small car. I cruise along real chill-like at 20 or 25 on flat pavement.
