Why won't this throwing knife damage players?

This throwing knife script is from an actual tool on the Roblox catalog. The knife works perfectly fine except for the fact that it doesn't damage the players. Does anyone have any idea why it doesn't damage the player?

local Tool = script.Parent
local Remote = Tool:WaitForChild("Remote")
local Handle = Tool:WaitForChild("Handle")

local FriendlyFire = false

local AttackPower = 1
local AttackDamage = 35
local AtackRechargeTime = 3
local AttackRecharge = 1/AtackRechargeTime
local AttackSpeed = 300

local Equipped = false
local Heartbeat = game:GetService("RunService").Heartbeat

local Knives = {}

--returns the wielding player of this tool
function getPlayer()
	local char = Tool.Parent
	return game:GetService("Players"):GetPlayerFromCharacter(char)
end

--helpfully checks a table for a specific value
function contains(t, v)
	for _, val in pairs(t) do
		if val == v then
			return true
		end
	end
	return false
end

--tags a human for the ROBLOX KO system
function tagHuman(human)
	local tag = Instance.new("ObjectValue")
	tag.Value = getPlayer()
	tag.Name = "creator"
	tag.Parent = human
	game:GetService("Debris"):AddItem(tag)
end

--used by checkTeams
function sameTeam(otherHuman)
	local player = getPlayer()
	local otherPlayer = game:GetService("Players"):GetPlayerFromCharacter(otherHuman.Parent)
	if player and otherPlayer then
		return player.TeamColor == otherPlayer.TeamColor
	end
	return false
end

--use this to determine if you want this human to be harmed or not, returns boolean
function checkTeams(otherHuman)
	return not (sameTeam(otherHuman) and not FriendlyFire)
end

function getKnife()
	local knife = Handle:clone()
	knife.Transparency = 0
	knife.Hit.Pitch = math.random(90, 110)/100
	
	local lift = Instance.new("BodyForce")
	lift.force = Vector3.new(0, 196.2, 0) * knife:GetMass() * 0.8
	lift.Parent = knife
	
	local proj = Tool.Projectile:Clone()
	proj.Disabled = false
	proj.Parent = knife
	
	return knife
end

function equippedLoop()
	while Equipped do
		local dt = Heartbeat:wait()
		
		if AttackPower < 1 then
			AttackPower = AttackPower + dt * AttackRecharge
			if AttackPower > 1 then
				AttackPower = 1
			end
		end
		
		Handle.Transparency = 1 - AttackPower
	end
end

function onLeftDown(mousePos)
	local knife = getKnife()
	knife.CFrame = CFrame.new(Handle.Position, mousePos)
	knife.Velocity = knife.CFrame.lookVector * AttackSpeed * AttackPower
	local damage = AttackDamage * AttackPower
	local touched
	touched = knife.Touched:connect(function(part)
		if part:IsDescendantOf(Tool.Parent) then return end
		if contains(Knives, part) then return end
		
		if part.Parent and part.Parent:FindFirstChild("Humanoid") then
			local human = part.Parent.Humanoid
			if checkTeams(human) then
				tagHuman(human)
				human:TakeDamage(damage)
				knife.Hit:Play()
			end
		end
		
		knife.Projectile:Destroy()
		
		local w = Instance.new("Weld")
		w.Part0 = part
		w.Part1 = knife
		w.C0 = part.CFrame:toObjectSpace(knife.CFrame)
		w.Parent = w.Part0
		
		touched:disconnect()
	end)
	table.insert(Knives, knife)
	knife.Parent = workspace
	
	game:GetService("Debris"):AddItem(knife, 3.5)
	delay(2, function()
		knife.Transparency = 1
	end)
	
	Remote:FireClient(getPlayer(), "PlayAnimation", "Throw")	
	
	Handle.Throw.Pitch = 0.8 + 0.4 * AttackPower
	Handle.Throw:Play()
	
	AttackPower = 0
end

function onRemote(player, func, ...)
	if player ~= getPlayer() then return end
	
	if func == "LeftDown" then
		onLeftDown(...)
	end
end

function onEquip()
	Equipped = true
	equippedLoop()
end

function onUnequip()
	Equipped = false
end

Remote.OnServerEvent:connect(onRemote)
Tool.Equipped:connect(onEquip)
Tool.Unequipped:connect(onUnequip)

Please help! Thanks!

the script doesn't have a function to tell if it even hit anything, that's why. insert this, and everything should be a go:

local function onTouch(otherPart)
	if otherPart.Parent:FindFirstChild("Humanoid") ~= nil then
		otherPart.Parent:FindFirstChild("Humanoid").Health = otherPart.Parent:FindFirstChild("Humanoid").Health - AttackDamage
	end
end
Handle.Touched:Connect(onTouch)

i didn't really implement the friendlyfire thing, since i dont really have much time / experience with teams and whatnot, but, hopefully this helps!

edit: didn't see 'see more lines' and i feel like an idiot