Cant make anything reacting to stamina being low

So,i wanted to add some low stamina effects to a sprint script i got from a tutorial,but for some reason it just doesn’t do anything though it reacts to the stamina being bigger than 50 and lower than 50,first i tried it with the blur,then after it didn’t work i thought that lighting effects just don’t work on localscripts, i tried adding a sound and it still didn’t work

Here’s the local script: (The low stamina effect thing is at the bottom)

local UserInputService = game:GetService("UserInputService")
local replicatedStorage = game:GetService("ReplicatedStorage")
local Players = game:GetService("Players")
local TweenService = game:GetService("TweenService")
local ContextActionService = game:GetService("ContextActionService")
local Player = game.Players.LocalPlayer

local HeavyBreathing = Instance.new("Sound")
HeavyBreathing.Name = "LowStam"
HeavyBreathing.SoundId = "rbxassetid://180315285"
HeavyBreathing.Parent = script.Parent
HeavyBreathing.Looped = true
HeavyBreathing.PlaybackSpeed = 1.5




local Info = TweenInfo.new(0.3,Enum.EasingStyle.Linear,Enum.EasingDirection.InOut,0,false,0)

local char = Players.LocalPlayer.Character

local debounce = nil

local Goals1 = {FieldOfView = 70}
local Goals2 = {FieldOfView = 80}

local function Run(actionName, userInputState, inputObject)
	if userInputState == Enum.UserInputState.Begin then print("Started")
		if debounce ~= true then
		debounce = true
		replicatedStorage.Sprint:FireServer("Began")
		TweenService:Create(workspace.Camera,Info,Goals2):Play()
		task.wait(5)
		debounce = false
	end
	end
	
	if userInputState == Enum.UserInputState.End then print("Ended")
		replicatedStorage.Sprint:FireServer("Ended")
			TweenService:Create(workspace.Camera,Info,Goals1):Play()
		
	end	
end
ContextActionService:BindAction("Running",Run,true,Enum.KeyCode.LeftShift)





-- Doesnt Work 
replicatedStorage.UpdateStam.OnClientEvent:Connect(function(stamina,maxStamina)
	print("GotTheEvent") -- Prints
	if stamina < 50 then
		HeavyBreathing:Play()
		print("Stamina < 50") -- Prints
	elseif stamina > 50 then
		if HeavyBreathing.Playing == true then
			HeavyBreathing:Stop()
		end
		print("Stamina > 50") -- Prints
	end
end)
-- Doesnt Work

And the serverscript

local replicatedStorage = game:GetService("ReplicatedStorage")
local Players = game:GetService("Players")
local runService = game:GetService("RunService")

local maxStamina = 500
local staminaRegen = 1
local SprintSpeed = 27

local sprintStaminaCost = 2

local sprintingPlayers = {}
Players.PlayerAdded:Connect(function(player)
	local stamina = Instance.new("IntValue",player)
	stamina.Value = maxStamina
	stamina.Name = "Stamina"
	
	stamina.Changed:Connect(function(property)
		replicatedStorage.UpdateStam:FireClient(player,stamina.Value,maxStamina)
	end)
end)

replicatedStorage.Death.OnServerEvent:Connect(function(player)
	local humanoid = player.Character.Humanoid
	humanoid.WalkSpeed = sprintingPlayers[player.Name]
	sprintingPlayers[player.Name] = nil
end)



replicatedStorage.Sprint.OnServerEvent:Connect(function(player,state)
	local humanoid = player.Character.Humanoid
	if state == "Began" and humanoid.MoveDirection.Magnitude > 0 then
		sprintingPlayers[player.Name] = humanoid.WalkSpeed
		humanoid.WalkSpeed = SprintSpeed
	elseif state == "Ended" and sprintingPlayers[player.Name] then
		humanoid.WalkSpeed = sprintingPlayers[player.Name]
		sprintingPlayers[player.Name] = nil
	
	end
	
end)

runService.Heartbeat:Connect(function()
	for index,player in pairs(Players:GetChildren()) do
		local stamina = player.Stamina
		local name = player.Name
		if not sprintingPlayers[name] then -- if not in the sprinting players table
			if stamina.Value > maxStamina  then
				stamina.Value = maxStamina
			elseif stamina.Value < maxStamina then
				stamina.Value += staminaRegen
			end
		else
			if stamina.Value >= sprintStaminaCost then
				stamina.Value -= sprintStaminaCost
			else
				player.Character.Humanoid.WalkSpeed = sprintingPlayers[name]
				sprintingPlayers[name] = nil
				
			end
		end
	end
end)

How can i make it do stuff when the stamina is low?
Thanks in advance.