def attack! player
    puts "#{self.name} attacks #{player.name}!"
    puts ""

    until self.hp <= 0 || player.hp <= 0
      self.hit player
      player.hit self
    end

    if self.hp > 0
      winner = self.name
    else
      winner = player.name
    end

    puts ""
    puts "The skies clear and the birds chirp as #{winner} wins!"
  end