How Can this script work?

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local function WaitForChild(parent, childName)
	assert(parent, "ERROR: WaitForChild: parent is nil")
	while not parent:FindFirstChild(childName) do parent.ChildAdded:wait() end
	return parent[childName]
end




local Tool = script.Parent
local ToolHandle = Tool.Handle

local wand = script.Parent
local stick = wand.Handle
local inc = script.Name
local owner, connect




local function Powers(hum)
local p = Instance.new("Part")
p.formFactor = "Symmetric"
p.Shape = "Ball"
p.Size = Vector3.new(5,5,5)
p.TopSurface = "Smooth"
p.BottomSurface = "Smooth"
p.Transparency = 1
p.BrickColor = "Really Red"
local sparx = Instance.new("Sparkles")
sparx.SparkleColor = "Really Black"
sparx.Enabled = true
sparx.Parent = p
coroutine.resume(coroutine.create(function()
wait(10)
p:Remove()
end))
local bv = Instance.new("BodyVelocity")
p.Parent = workspace
p.Name = "Power"
p.CFrame = stick.CFrame * CFrame.new(0,1.5,0)
bv.Parent = p
bv.velocity = ((owner.Character.Humanoid.TargetPoint - p.Position).unit) * 200
p.Touched:connect(function(part)
SpellAffect(part,p)
end)
end



		
local function OnKeyDown(key)
	key = string.lower(key)
	if key == 'e' then
		local now = time()
		if now 
		
		then
		
		hum()
			
		end

local function OnEquipped(mouse)
	MyModel = Tool.Parent
	mouse.KeyDown:connect(OnKeyDown)


local function OnUnequipped()
	hum.remove()
end
	end
	
 end
	


hum()
Tool.Equipped:connect(OnEquipped)
Tool.Unequipped:connect(OnUnequipped)