The actual definition of going against your team's winning condition, i.e. imprisoning and slaying a revealed Mayor.
Screenshot of the happening itself:
https://imgur.com/49mZ7s7
Names and handles: (Jailor is timmytootwotoo)
https://imgur.com/9dKPpgR
Sad to see stuff like these on Platinum Ranked but oh well.
Thanks for looking into it.