Class methods [ruby]

Question

In the code below why is the method .fight defined outside the class?

class Player
attr_accessor :name, :health, :power
def initialize(n, h, pow)
@name = n
@health = h
@power = pow
end
def isAlive
@health > 0
end
def hit(opponent)
opponent.health -= self.power
end
def to_s
"#{name}: Health: #{health}, Power: #{power}"
end
end

def fight(p1, p2)
while p1.isAlive && p2.isAlive
p1.hit(p2)
p2.hit(p1)
show_info(p1, p2)
end

if p1.isAlive
puts "#{p1.name} WON!"
elsif p2.isAlive
puts "#{p2.name} WON!"
else
puts "TIE!"
end
end

def show_info(*p)
p.each { |x| puts x}
end

#initialize Players
puts "PLAYERS INFO"
p1 = Player.new("Player 1", 1+rand(100), 1+rand(20))
p2 = Player.new("Player 2", 1+rand(100), 1+rand(20))

#show Player info
show_info(p1, p2)

puts "LETS FIGHT!"
fight(p1, p2)

Answer 1

// Please, insert your code to solve a problem.