So lately i discovered a little cheat how to see a visible cheater/hacker in sumo areas or Pvp areas . All u have to do to see them is to go to ur options and click The " Super secret settings " then u will be available to see them ! if u don t have the option "super secret settings" then ur on f11 mode so just turn it off by clicking f11. to get rid of the super secret setting click the button until normal minecraft appears or just click f5 . It might not work for everyone! :p