My RemoteEvent is firing, but my script is not working properly?

I have a LocalScript inside the player(s), which records if a player presses, and releases a certain key, which in this case, is Z. Pressing the key fires the GomuPistolEvent and KeyHeld = true, releasing the key fires the GomuPistolEvent and KeyHeld = false. My problem is that the script I have in ServerScriptService that is supposed to check for the event runs the remote the first time, during the "if KeyHeld then", but not the second time, during the "elseif not KeyHeld then". Could anyone explain what am I doing wrong?

Thanks!

LocalScript:

--//Services
local UserInputService = game:GetService('UserInputService')
local ReplicatedStorage = game:GetService('ReplicatedStorage')
local ServerStorage = game:GetService('ServerStorage')
local ServerScriptService = game:GetService('ServerScriptService')
local Players = game:GetService('Players')
local GomuRemotes = ReplicatedStorage.Remotes.DevilFruits:WaitForChild('GomuGomu')

--//Variables
local GomuPistolEvent = GomuRemotes.GomuPistol:WaitForChild('GomuPistolEvent')
local Player = game.Players.LocalPlayer
local KeyHeld = true
local Debounce = false

--//Coding
function onKeyPress(input, gameEvent)
	if not Debounce and not gameEvent then
		Debounce = true
		if input.KeyCode == Enum.KeyCode.Z then
			KeyHeld = true
			GomuPistolEvent:FireServer(Player, KeyHeld)
			print('Z')
		end
		if input.KeyCode == Enum.KeyCode.X then
		end
		if input.KeyCode == Enum.KeyCode.C then
		end
		if input.KeyCode == Enum.KeyCode.V then
		end
		if input.KeyCode == Enum.KeyCode.B then
		end
		Debounce = false
	end
end
function onKeyRelease(input, gameEvent)
	if input.KeyCode == Enum.KeyCode.Z then
		KeyHeld = false
		GomuPistolEvent:FireServer(Player, KeyHeld)
		print('ZRelease')
	end
	if input.KeyCode == Enum.KeyCode.X then
	end
	if input.KeyCode == Enum.KeyCode.C then
	end
	if input.KeyCode == Enum.KeyCode.V then
	end
	if input.KeyCode == Enum.KeyCode.B then
	end
end

UserInputService.InputBegan:Connect(onKeyPress)
UserInputService.InputEnded:Connect(onKeyRelease)

ServerScript:

--//Services
local UserInputService = game:GetService('UserInputService')
local ReplicatedStorage = game:GetService('ReplicatedStorage')
local ServerStorage = game:GetService('ServerStorage')
local ServerScriptService = game:GetService('ServerScriptService')
local Players = game:GetService('Players')
local GomuRemotes = ReplicatedStorage.Remotes.DevilFruits:WaitForChild('GomuGomu')

--//Variables
local GomuPistolEvent = GomuRemotes.GomuPistol:WaitForChild('GomuPistolEvent')
local DamageModule = require(ServerStorage.Server.DamageService)

--//Animations
local GomuPistolAnim = Instance.new('Animation')
GomuPistolAnim.AnimationId = 'rbxassetid://2188557970'
GomuPistolAnimTrack = nil

--//Coding
GomuPistolEvent.OnServerEvent:Connect(function(Player, KeyHeld)
	local Character = game.Workspace:WaitForChild(Player.Name)
	local Humanoid = Character:FindFirstChildOfClass('Humanoid')
	local RightArm = Character:WaitForChild('RightLowerArm')
	local RightHand = Character:WaitForChild('RightHand')
	local LeftArm = Character:WaitForChild('LeftLowerArm')
	local LeftHand = Character:WaitForChild('LeftHand')
	local Mouse = Player:GetMouse()
	local MousePosition = Mouse.Hit.p
	local Damaging = false
	local Attacking = false
	local Damage = nil
	local Cooldown = nil
	local Range = nil
	local BodyGyro = nil
	local BodyPosition = nil
	local ArmStretch = nil
	local Weld = nil

	if KeyHeld then
		GomuPistolAnimTrack = Humanoid:LoadAnimation(GomuPistolAnim)
		GomuPistolAnimTrack:Play()
		GomuPistolAnimTrack.KeyframeReached:Connect(function(Keyframe)
			if KeyHeld and Keyframe == 'Charge' then
				GomuPistolAnimTrack:AdjustSpeed(0)
			end
		end)
		print('pistolcharge')
		Attacking = true
		BodyGyro = Instance.new('BodyGyro', Character.LowerTorso)
		BodyGyro.Name = 'SkillGyro'
		BodyGyro.D = 100
		BodyGyro.MaxTorque = Vector3.new(math.huge, math.huge, math.huge)
		BodyPosition = Instance.new('BodyPosition', Character.LowerTorso)
		BodyPosition.Name = 'SkillPosition'
		BodyPosition.Position = Character.HumanoidRootPart.Position
		BodyPosition.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
		while KeyHeld do
			MousePosition = Mouse.Hit.p
			BodyGyro.CFrame = CFrame.new(Character.LowerTorso.Position, MousePosition) * CFrame.Angles(0, math.rad(-90) ,0)
			wait()
		end
	elseif not KeyHeld then
		GomuPistolAnimTrack:AdjustSpeed(1)
		print('pistol')
		BodyGyro.CFrame = CFrame.new(Character.LowerTorso.Position, MousePosition)
		GomuPistolAnimTrack.KeyframeReached:Connect(function(Keyframe)
			if Keyframe == 'Pistol' then
				Damaging = true
				ArmStretch = Instance.new('Part', Character)
				ArmStretch.Name = 'ArmStretchRight'
				ArmStretch.Color = RightArm.Color
				ArmStretch.Size = RightArm.Size
				ArmStretch.CanCollide = false
				RightArm.Transparency = 1
				RightHand.Transparency = 1
				Weld = Instance.new('Weld', ArmStretch)
				Weld.Part0 = ArmStretch
				Weld.Part1 = RightArm
				Weld.C0 = CFrame.new(0, 0, 0) * CFrame.new(0, 0, 0)
			end
			if Keyframe == 'End' then
				Character.LowerTorso:WaitForChild('SkillGyro'):Destroy()
				Character.LowerTorso:WaitForChild('SkillPosition'):Destroy()
				Character:WaitForChild('ArmStretchRight'):Destroy()
				if RightArm.Transparency == 1 then RightArm.Transparency = 0 end
				if RightHand.Transparency == 1 then RightHand.Transparency = 0 end
				BodyGyro = nil
				BodyPosition = nil
				ArmStretch = nil
				Weld = nil
				Attacking = false
			end
		end)
	end

	RightArm.Touched:Connect(function(hitPart)
		if Attacking and hitPart.Parent:FindFirstChild('Humanoid') and Damaging then
			Damaging = false
			local HumanoidToDamage = hitPart.Parent:FindFirstChild('Humanoid')
			DamageModule.Combat(HumanoidToDamage, Damage)
		end
	end)
	LeftArm.Touched:Connect(function(hitPart)
		if Attacking and hitPart.Parent:FindFirstChild('Humanoid') and Damaging then
			Damaging = false
			local HumanoidToDamage = hitPart.Parent:FindFirstChild('Humanoid')
			DamageModule.Combat(HumanoidToDamage, Damage)
		end
	end)
end)