I think these are manually detonated.
LaFinlandia
AI - elevenlabs.io
It went down in Russia.
PTM-3 mines have a magnetic fuze and are used most often for remote mining by drones. They've also replaced a lot of the pressure fuzes on TM-62s with magnetic fuzes.
There were no reports of drones or missiles. That leaves sabotage, incompetence, or sabotage disguised as incompetence. The AFU usually takes credit the same day for sabotage and Russia blames it on "safety violations".
Robert Magyar, commander of the 414th Strike UAV Brigade.
https://youtube.com/@magyarbirds
Not a dumb question at all. When AA guns miss, the bullets eventually fall back down, often tumbling, which slows them down but doesn’t make them harmless. Even tumbling rounds can injure or kill. Collateral damage does happen but often goes unreported due to censorship or lack of clear attribution.
Luckily for him, his neck broke his fall.