How to make a cooldown period between attacks?

With this current script, the NPC just spams the attack over and over. I tried to keep it from spamming but I can never get it to work. The spam also keeps the slash sound from playing after the first time.

local larm = script.Parent.Parent:FindFirstChild("Left Arm")
local rarm = script.Parent.Parent:FindFirstChild("Right Arm")
function findNearestTorso(pos)
	local list = game.Workspace:children()
	local torso = nil
	local dist = 30
    local temp = nil
    local human = nil
	local temp2 = nil
	for x = 1, #list do
		temp2 = list[x]
		if (temp2.className == "Model") and (temp2 ~= script.Parent.Parent) then
			temp = temp2:findFirstChild("HumanoidRootPart")
			human = temp2:findFirstChild("Humanoid")
			if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
				local cool = false
				if (temp.Position - pos).magnitude < dist then
					torso = temp
					dist = (temp.Position - pos).magnitude
				end
				if cool == false then
					if (temp.Position - pos).magnitude <= 4 then
						cool = true
						local anim = Instance.new("Animation")
						anim.Name = "Slash"
						anim.AnimationId = "http://www.roblox.com/Asset?ID=27432559"
						anim.Parent = script.Parent.Parent
						local track = script.Parent.Parent.Humanoid:LoadAnimation(anim)
						track:Play(0)
						script.Parent.Handle.SwordSlash:Play()
					end	
				end
			end
		end
	end
	return torso
end

while true do
	wait(1)
	local target = findNearestTorso(script.Parent.Parent.HumanoidRootPart.Position)
end 

Edit: Removed questionable unused script. Edit 2: Found out that he never stops attacking even after I move way away.

Let's use a debounce and use spawn for our cooldown

I'll create variable called db and set it to true, when the attack happens i will check if it is true, if so setting it to false and then using spawn to put waiting a certain amount of time (cooldown) and setting db to true in another thread.

I am assuming that the code after

if (temp.Position - pos).magnitude <= 4 then

is the attack

--my variable
local db=true

local larm = script.Parent.Parent:FindFirstChild("Left Arm")
local rarm = script.Parent.Parent:FindFirstChild("Right Arm")
function findNearestTorso(pos)
    local list = game.Workspace:children()
    local torso = nil
    local dist = 30
    local temp = nil
    local human = nil
    local temp2 = nil
    for x = 1, #list do
        temp2 = list[x]
        if (temp2.className == "Model") and (temp2 ~= script.Parent.Parent) then
            temp = temp2:findFirstChild("HumanoidRootPart")
            human = temp2:findFirstChild("Humanoid")
            if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
                local cool = false
                if (temp.Position - pos).magnitude < dist then
                    torso = temp
                    dist = (temp.Position - pos).magnitude
                end
                if cool == false then
		--i add check for db
                    if (temp.Position - pos).magnitude <= 4 and db==true then
			--set db to false
			db=false
                        cool = true
                        local anim = Instance.new("Animation")
                        anim.Name = "Slash"
                        anim.AnimationId = "http://www.roblox.com/Asset?ID=27432559"
                        anim.Parent = script.Parent.Parent
                        local track = script.Parent.Parent.Humanoid:LoadAnimation(anim)
                        track:Play(0)
                        script.Parent.Handle.SwordSlash:Play()
			--new thread using spawn
			spawn(function()
				--cooldown time
				wait(5)
				--set db to true
				db=true
			end)
                    end 
                end
            end
        end
    end
    return torso
end

while true do
    wait(1)
    local target = findNearestTorso(script.Parent.Parent.HumanoidRootPart.Position)
    if target ~= nil then
        wait(0.2)
        script.Parent.Humanoid:MoveTo(target.Position, target)
    end 
end