What can i do to filterenabled this local script?

When the local script is given to the player, its parent into the players character, They can see it only but no one else can, Or do i need to write an entire new script?

wait(0.5)
local player = game.Players.LocalPlayer
local pgui = player.PlayerGui
local character = player.Character
local head = character:findFirstChild("Head")
local torso = character:findFirstChild("Torso")
local hum = character:findFirstChild("Humanoid")

script.Parent = character

local r_serv = game:GetService("RunService")

local kls = script.KillShield
local tkd = script.TakeDamage
tkd.Value = false
kls.Value = false

local g1 = script.ShieldBilboard:clone()
g1.Enabled = true
g1.Adornee = head
local g2 = script.ShieldGUI:clone()

local defense_time = 2
local health = 3

local spart = Instance.new("Part")
spart.BrickColor = BrickColor.new("Toothpaste")
spart.formFactor = "Custom"
spart.Size = Vector3.new(0.2, 0.2, 0.2)
spart.CFrame = torso.CFrame
spart.TopSurface = 0
spart.BottomSurface = 0
spart.Transparency = 1
spart.Name = "ShieldPart"
local dlti = Instance.new("IntValue", spart)
dlti.Name = "DeleteMe"
local m = Instance.new("SpecialMesh", spart)
m.MeshType = "Sphere"
spart.Parent = character
local lg = Instance.new("PointLight", spart)
lg.Shadows = true
lg.Color = Color3.new(0, 1, 1)
lg.Brightness = 100
lg.Range = 0

hum.Died:connect(function()
	g1:remove()
	g2:remove()
	spart:remove()
end)

local w = Instance.new("Weld")
w.Part0 = torso
w.Part1 = spart
w.Parent = spart

local imgs = {"145252587", "145252589", "145252591", "145252593"}

local ric = {Instance.new("Sound", spart), Instance.new("Sound", spart)}
ric[1].SoundId = "http://www.roblox.com/asset/?id=145183456"
ric[1].Volume = 1
ric[2].SoundId = "http://www.roblox.com/asset/?id=145183460"
ric[2].Volume = 1

local loop = Instance.new("Sound", spart)
loop.Looped = true
loop.SoundId = "http://www.roblox.com/asset/?id=144764911"
loop.Volume = 1
coroutine.resume(coroutine.create(function()
	wait(0.4)
	loop:play()
end))


g1.Parent = character
g2.Parent = pgui

local sh1 = g1.Shield
local sh2 = g2.Frame.Shield
function SetState(st)
	sh1.Image = "http://www.roblox.com/asset/?id=" .. imgs[4 - st]
	sh2.Image = "http://www.roblox.com/asset/?id=" .. imgs[4 - st]
end
SetState(0)

function smoothstep(x)
	return x*x*(3 - 2*x)
end

local loadit = 0
while loadit < 0.8 do
	local st = tick()
	r_serv.RenderStepped:wait()
	loadit = math.min(0.8, loadit + (tick() - st))
	local am = loadit / 0.8
	spart.Transparency = 1 - (am * 0.1)
	spart.Reflectance = am * 0.3
	m.Scale = Vector3.new(smoothstep(am) * 31, smoothstep(am) * 31, smoothstep(am) * 31)
	loop.Volume = am * 0.6
	SetState(math.floor(am * 3))
	lg.Range = am * 5
end

local being_damaged = false
local run_anim = true

kls.Changed:connect(function()
	SetState(0)
	health = 0
	run_anim = false
end)
kls.Value = false

tkd.Changed:connect(function()
	if health == 0 then return end
	tkd.Value = false
	if not being_damaged then
		being_damaged = true
		spart.BrickColor = BrickColor.new("Lime green")
		lg.Color = Color3.new(0, 1, 0)
		loop.Volume = 1
		ric[math.random(1, #ric)]:play()
		
		
		local ld = 0
		while ld < defense_time do
			local st = tick()
			r_serv.RenderStepped:wait()
			ld = math.min(defense_time, ld + (tick() - st))
			
			local fls = math.floor(ld * 6)
			local gmode = (fls / 2 == math.floor(fls / 2))
			if gmode then
				SetState(health)
			else
				SetState(health - 1)
			end
		end
		
		health = health - 1
		SetState(health)
		if health == 0 then
			run_anim = false
		end
		
		loop.Volume = 0.6
		lg.Color = Color3.new(0, 1, 1)
		spart.BrickColor = BrickColor.new("Toothpaste")
		being_damaged = false
	end
end)
tkd.Value = false

while run_anim do
	r_serv.RenderStepped:wait()
	local mesh_sz = math.sin(math.rad(tick() * 90 * 0.5)) * 1
	m.Scale = Vector3.new(31 + mesh_sz, 31 + mesh_sz, 31 + mesh_sz)
	if not being_damaged then
		spart.Transparency = 0.9 + (math.cos(math.rad(tick() * 90 * 0.4)) * 0.03)
	else
		spart.Transparency = 0.8 + (math.cos(math.rad(tick() * 90 * 0.4)) * 0.03)
	end
end

local loadit = 0
while loadit < 0.8 do
	local st = tick()
	r_serv.RenderStepped:wait()
	loadit = math.min(0.8, loadit + (tick() - st))
	local am = 1 - (loadit / 0.8)
	spart.Transparency = 1 - (am * 0.1)
	spart.Reflectance = am * 0.3
	m.Scale = Vector3.new(smoothstep(am) * 31, smoothstep(am) * 31, smoothstep(am) * 31)
	loop.Volume = am * 0.6
	lg.Range = am * 5
end

g1:remove()
g2:remove()
spart:remove()
script:remove()