Saying non credible af here, but in theory one could add a upwards facing shotgun shells on top of the helmet, triggered by a Camera/proximity sensor if it detects a drone/falling grande. Maybe add a gyroscope to check if the helmet is actually facing upwards before triggering. All in all unit cost could be below 250$
- 6x 12 gauge shells with bird shot
- Raspberry pi type controller
- USB cam
- Laser distance sensor
- gyroscope
- servo trigger
Potentially, but at that point it probably would have lost its lethal velocity, so the worst that could happen is it gets stuck in your hair or falls into your shirt or something.