Here's the manual: https://riotmedicine.net/static/downloads/riot-medicine.pdf
Probably someone should archive it. Is there a preferred upload location for documents? I downloaded it locally already.
This thing reads like a dungeon masters guide and seriously these kids are larping a dangerous game. If anyone is doubting how serious and organized these people are after this, this manual should be a wake up call.
http://web.archive.org/web/20200523210547/https://riotmedicine.net/static/downloads/riot-medicine.pdf