Trouble with BillboardGui & Server/Local scripts

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#1

I have a script inside of a tool and when that tool hits a player, the script detects it and fires a BindableEvent. That then passes the player who got hit’s information over and Knocks/Downs them. I have a few issues with it though, first of all the timer does not show up on the BillboardGui I created nor does it change color. Second of all I don’t know if the Knocking script should be a server or client script (it is a server script right now), because I think the server script only functions one at a time. Here are the scripts:
KnockingScript (Server, Inside ServerScriptService):

local RS = game:GetService("ReplicatedStorage")
local BE = RS.ReviveBE
local KnockedAnim = script:WaitForChild("KnockedAnim")

local BBG = game.ServerStorage.BillboardGui
local BBGE = game.ReplicatedStorage.RemoteEvents.BillboardGuiEvent

local ReviveSound = script.ReviveSound

local Timer = 30

local revivePrompt = game.ServerStorage.RevivePrompt

local CC = RS.ColorChanger
local CC2 = RS.ColorChanger2

local knocked = false

local TimerPaused = false
local StopTimer = false

BE.Event:Connect(function(playerThatWasHit)
	wait(0.5)
	print("Player was hit:", playerThatWasHit)
	local Humanoid = playerThatWasHit.Character and playerThatWasHit.Character:FindFirstChild("Humanoid")
	if Humanoid then
		if knocked == false then
			knocked = true
			
			Humanoid.WalkSpeed = 8
			local KAP = Humanoid.Animator:LoadAnimation(KnockedAnim)
			KAP:Play()

			local ClonedBBG = BBG:Clone()
			ClonedBBG.Parent = Humanoid.Parent.Head
			local ClonedRP = revivePrompt:Clone()
			ClonedRP.Parent = Humanoid.Parent.UpperTorso
			ClonedRP.ActionText = "Recover " ..playerThatWasHit.name

			local function startTimer()
				local remainingTime = Timer

				while remainingTime > 0 do
					if TimerPaused == false then
						if StopTimer == false then
							BBGE:FireAllClients(playerThatWasHit, remainingTime)
							wait(1)
							remainingTime -= 1
							print(remainingTime)
							if remainingTime <= 0 then
							Humanoid.Health = 0
							print("Timer ran out, Humanoid died")
							ClonedBBG:Destroy()
							ClonedRP:Destroy()
							end
						else
							print("Timer Stopped")
							StopTimer = false
							break
						end
					else
						print("Timer Paused")
						wait(1)
					end
				end
			end
			local TimerCoroutine = coroutine.create(startTimer)
			coroutine.resume(TimerCoroutine)

			ClonedRP.Triggered:Connect(function()
				KAP:Stop()
				Humanoid.WalkSpeed = 16
				ReviveSound:Stop()
				StopTimer = true
				task.wait(0.1)
				ClonedRP:Destroy()
				ClonedBBG:Destroy()
				knocked = false
				print("PromptTriggered")
			end)

			ClonedRP.PromptButtonHoldBegan:Connect(function()
				ReviveSound:Play()
				CC:FireAllClients()
				print("Begining Hold")
				TimerPaused = true
			end)

			ClonedRP.PromptButtonHoldEnded:Connect(function()
				ReviveSound:Stop()
				CC2:FireAllClients()
				print("Stopped Holding")
				TimerPaused = false
			end)
		else
			return
		end
	end
end)

ToolDetectionScript (Server, Inside of the tool in StarterPack):

local DebounceTable = {}
local RS = game:GetService("ReplicatedStorage")
local BE = RS.ReviveBE

script.Parent:WaitForChild("HitBox").Touched:Connect(function(hitPart)
	if hitPart.Parent and hitPart.Parent:WaitForChild("Humanoid") then
		local playerCharacter = hitPart.Parent
		local player = game.Players:GetPlayerFromCharacter(playerCharacter)
		if player then
			if DebounceTable[player] == true then return end
			DebounceTable[player] = true
			BE:Fire(player)
			--print("Successfully fired the BindableEvent")
			wait(2)
			DebounceTable[player] = nil
	else
		print("Not a player")
		end
	end
end)

BillboardGuiScript (Client, Inside the text label in the BillboardGui in ServerStorage):

local replicatedStorage = game:GetService("ReplicatedStorage")
local BillBoardGuiEvent = replicatedStorage.RemoteEvents.BillboardGuiEvent

local textlabel = script.Parent
local Revivetextlabel = script.Parent.Parent.ReviveIP

local CC = replicatedStorage.ColorChanger
local CC2 = replicatedStorage.ColorChanger2

BillBoardGuiEvent.OnClientEvent:Connect(function(player, remainingTime)
	if player == game.Players.LocalPlayer then
		textlabel.Text = tostring(remainingTime)
	end
end)

CC.OnClientEvent:Connect(function()
	Revivetextlabel.TextColor3 = Color3.new(0, 0.666667, 0)
	Revivetextlabel.Text = "Recovery In Progress"
end)


CC2.OnClientEvent:Connect(function()
	Revivetextlabel.TextColor3 = Color3.new(1, 0, 0)
	Revivetextlabel.Text = "Awaiting Recovery"
end)