How would you fix characters dying, but only client side?

I was working on this code for a long time and it works but only client side by, the way I have FE on.

wait()
local Tool = script.Parent
local Handle = Tool.Handle
local Barrel = Tool.Barrel
local Player
local Character

local anim = Instance.new("Animation")
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local Humanoid = player.Character.Humanoid
local AnimationR = Instance.new("Animation")
local Animation = Instance.new("Animation")
Animation.AnimationId = "rbxassetid://6682923631"
AnimationR.AnimationId = "rbxassetid://6684441078"
local Anim = Humanoid:LoadAnimation(Animation)
local AnimR = Humanoid:LoadAnimation(AnimationR)
local GoodHit = {245630921, 245630994, 245631056, 252944176, 245631167}
local MissHit = {142082166, 303465115, 303465155, 233091225, 303465215}

local DamageMin = 15
local DamageMax = 20

local Enabled = true
local Reloading = false
local Firing = false

local ReloadTime = 3

local AmmoGui = nil

local Hum
function fireGun(originCF, aimToCF, lengthOfRay)
	if Handle:FindFirstChild('Fire') then
		Handle.Fire:Play()
	end
	local DetectionRay = Ray.new(originCF, (aimToCF - originCF).unit * lengthOfRay)
	local PartHit, Position, IntersectPoint, MaterialHit = workspace:FindPartOnRay(DetectionRay, Character)
	if PartHit then
		Hum = PartHit.Parent:FindFirstChild('Humanoid')
		if not Hum then
			Hum = PartHit.Parent.Parent:FindFirstChild('Humanoid')
		end
		if Hum then
			local count = math.random(DamageMin, DamageMax)
			Hum:TakeDamage(count)
		end
	end
	Enabled = false
	Barrel.MuzzleFlare.FlareImage.Rotation = math.random(-360, 360)
	for _,muzzleinstance in ipairs(Barrel:GetChildren()) do
		if string.sub(muzzleinstance.Name, 1, 6) == 'Muzzle' then
			muzzleinstance.Enabled = true
			Anim:Play()	
		end
	end
	Tool.Ammo.Value = Tool.Ammo.Value - 1
	upGui()
	wait(0.075)
	for _,muzzleinstance in ipairs(Barrel:GetChildren()) do
		if string.sub(muzzleinstance.Name, 1, 6) == 'Muzzle' then
			muzzleinstance.Enabled = false
			Anim:Stop()	
		end
	end
	Enabled = true
end
function reloadWep()
	if Tool.Ammo.Value < Tool.Ammo.MaxValue then
		Reloading = true
		Firing = false
		Tool.Handle.Reload:Play()
		wait(ReloadTime)
		Tool.Ammo.Value = Tool.Ammo.MaxValue
		Reloading = false
		upGui()
	end
end

function upGui()
	if AmmoGui then
		AmmoGui.Counter.Max.Text = tostring(Tool.Ammo.MaxValue)
		AmmoGui.Counter.Curr.Text = tostring(Tool.Ammo.Value)
	end
end

Tool.Equipped:connect(function (mouse)
	Character = Tool.Parent
	Player = game:GetService('Players'):GetPlayerFromCharacter(Character)
	mouse.Icon = 'rbxassetid://24007329'
	AmmoGui = Tool.AmmoDisplay:Clone()
	AmmoGui.Parent = Player.PlayerGui
	upGui()
	if Handle:FindFirstChild('Equip') then
		Handle.Equip:Play()
	end
	mouse.Button1Down:connect(function ()
		if Enabled and (not Reloading) then
			Firing = true
		end
		while Firing == true do
			if Enabled and (not Reloading) then
				if Tool.Ammo.Value == Tool.Ammo.MinValue then
					reloadWep()
				else
					fireGun(Barrel.CFrame.p, mouse.Hit.p, 999)
				end
			end
			wait()
		end
	end)
	mouse.Button1Up:connect(function ()
		Firing = false
	end)
	mouse.KeyDown:connect(function (key)
		if key == 'r' then
			if Enabled and (not Reloading) and Tool.Ammo.Value < Tool.Ammo.MaxValue then
				AnimR:Play()
				reloadWep()
			end
		end
	end)
end)
Tool.Unequipped:connect(function ()
	if Character then
		Character = nil
	end
	if Player then
		Player = nil
	end
	for _,sound in ipairs(Handle:GetChildren()) do -- In attempt to stop the glitch
		if sound:IsA('Sound') then
			sound:Stop()
			sound.TimePosition = 0
		end
	end
	Firing = false
	if AmmoGui then
		AmmoGui:Destroy()
		AmmoGui = nil
	end
end)