Why my script do not work with my module script when I use debounce in script?

If I take debounce off from local script, it'll work. However, it'll hit multiple times. Can someone help?

This is my script

local module = {}
local debounce = false

function module.FireHot(hit)
	local parent = hit.Parent 
	if (parent) then
		local hum = parent:FindFirstChild("Humanoid")
		if (hum)  then
			
			for i = 1,5 do
				hum:TakeDamage(2)
				wait(2)
			end
		end 
			
	end

end
return module

This is my module script

local module = {}
local debounce = false

function module.FireHot(hit)
	local parent = hit.Parent 
	if (parent) then
		local hum = parent:FindFirstChild("Humanoid")
		if (hum)  then
			
			for i = 1,5 do
				hum:TakeDamage(2)
				wait(2)
			end
		end 
			
	end

end
return module