According to the tweet from the Doubs Police Department (Préfet du Doubs), the department who injured the high schooler, he is back home with his family:
https://twitter.com/Prefet25/status/1071021059292495872
Translation: The injured student this morning returned home accompanied by his family. His wound is not serious.
French Huffpost also is reporting the kid is not dead and his death is a rumor being spread on social media:
https://www.huffingtonpost.fr/2018/12/07/un-lyceen-blesse-a-montbeliard-la-prefecture-dement-la-rumeur-de-sa-mort_a_23611532/
They need batman armor to keep the citizens in check.
Probably hanging out at an old folks home.
There's obviously a lack of proper education/house training involved here.