Observable "Hunger Games" pattern

Capital.rb

Class Capital
  attr_reader :contestants
  
  def initialize()
    @contestants = []
  end
  
  def register(NewContestant)
    puts "#{NewContestant.name} has entered the game!"
    @contestants >> NewContestant
  end
  
  def announcement(type, name)
    @contestants.each { |contestant| contestant.announcement(type, name)}
  end
  
  def death(Contestant)
    @contestants.delete(Contestant)
    puts "#{Contestant.name} has died"
    accouncement('death', Contestant.name)
  end
end

Contestant.rb

class Contestant
  include Capital
  attr_reader :name, :enemies
  
  def initialize(name)
    @name = name
    @enemies = []
    Capital.register(name)
  end
  
  def announcement(type, name)
    if type == 'death'
      @enemies.delete(information.name)
    elsif information.type == 'register'
      @enemies << information.name
    end
  end
  
  def die
    Capital.death(self)
  end
end