Script breaks in Filtering Enabled?[more info in question]

I've got a script that I took from an open source game to play around with, but got frustrated when I couldn't make the script work in FilteringEnabled. It was originally a local script, but since I know that local scripts cannot create instances for anyone besides the player who created it, I changed it to a server sided script and changed Local Player = game.Players.LocalPlayer, to, local Player = script.Parent.Parent.Parent.

The script is inside of a tool that is inside of the StarterPack.

What exactly about it is broken? Well.. everything really. All the player can do with the tool here is equip it, and the idle animation doesn't even play. I tested this outside of FE mode, and it worked perfectly, so I think that this is an FE issue.

Should I maybe try using RemoteEvents for it? If so, where should I use them at?

Thanks for your time.

script: (it's a combat script that plays animations and does damage to mimic melee combat)

wait(0.5)
local play = script.Parent.Parent.Parent
local char = play.Character
local hum = char.Humanoid
local Tool = script.Parent
local mouse = play:GetMouse()
hit = Tool.Handle.Hit
local anim = nil
local jump = false
local tim = 0
local equipped = false
local damage = play.Levelss.CombatDamage.Value
local attack = ""
local throwing = true
local alternate = false
local idle  = hum:LoadAnimation(script.Idle)
local p = true
function weldTogether(x,y)
    local W = Instance.new("Weld")
    W.Part0 = x
    W.Part1 = y
    local CJ = CFrame.new(x.Position)
    local C0 = x.CFrame:inverse()*CJ
    local C1 = y.CFrame:inverse()*CJ
    W.C0 = C0
    W.C1 = C1
    W.Parent = x
end

fist1 = Instance.new("Part")
fist1.FormFactor = "Custom"
fist1.Name = "Point"
fist1.Size = Vector3.new(1,2,1)
fist1.Transparency = 1
fist1.CanCollide = false
fist1.CFrame = char["RightHand"].CFrame + (char["RightHand"].CFrame* CFrame.Angles(math.rad(-90),0,0)).lookVector
fist2 = fist1:clone()
fist2.CFrame =  char["LeftHand"].CFrame + (char["LeftHand"].CFrame * CFrame.Angles(math.rad(-90),0,0)).lookVector
foot1 = fist1:clone()
foot1.CFrame =  char["RightLowerLeg"].CFrame + (char["RightLowerLeg"].CFrame * CFrame.Angles(math.rad(-90),0,0)).lookVector
weldTogether(fist1, char["RightHand"])
weldTogether(fist2, char["LeftHand"])
weldTogether(foot1, char["RightLowerLeg"])
fist1.Parent = Tool
fist2.Parent = Tool
foot1.Parent = Tool

fist1.Touched:connect(function(hit)
    touchy(fist1, "RightPunch", hit)

end)
fist2.Touched:connect(function(hit)
    touchy(fist2, "LeftPunch", hit)

end)
foot1.Touched:connect(function(hit)
    touchy(foot1, "AirKick", hit)
end)



function swoosh()
    Tool.Handle.Swoosh.Pitch = math.random(10,14)/10
    Tool.Handle.Swoosh:Play()
end
local animTrack = nil
function animate()
    if animTrack ~= nil then
        animTrack:Stop()
    end
    attack = ""
    if jump == true then -- in the  air
        if (game.Workspace.DistributedGameTime - tim) < 0.15 then -- uppercut
            attack = "RightPunch" -- attacking part
            swoosh()
            animTrack = hum:LoadAnimation(script.Uppercut)
            animTrack:Play()
            wait(0.3)

    else  -- kick
        attack = "AirKick"
        swoosh()
        animTrack = hum:LoadAnimation(script.AirKick)
        animTrack:Play()
        wait(0.3)

    end

    else -- not in the air
        if alternate == false then -- right punch
            alternate = true
            attack = "RightPunch"
            swoosh()
            animTrack = hum:LoadAnimation(script.RightPunch)
            animTrack:Play()
            wait(0.2)
    else -- left punch
        alternate = false
        attack = "LeftPunch"
        swoosh()
        animTrack = hum:LoadAnimation(script.LeftPunch)
        animTrack:Play()
        wait(0.2)

    end

    end
end


function attacker(humanoid)
    --determine animation
    hit.Pitch = math.random(10,14)/10
    local ldamage = damage
    if humanoid:findFirstChild("Effects") then
    else
        hit:Play()
    end
    if humanoid:FindFirstChild("Effects") then
        if humanoid.Effects:FindFirstChild("Metal") then
            ldamage = 3.25
        end
    end
    if humanoid:findFirstChild("DamageSystem") and not humanoid.Parent:findFirstChild("IsAShip") then -- do damage
        script.Parent.Damage:FireServer(humanoid, play, ldamage)
    elseif not humanoid.Parent:findFirstChild("IsAShip") then
        humanoid:TakeDamage(ldamage)
    end
end

en = true
mouse.Button1Down:connect(function() -- click
    if  Tool.Parent == char and play.Levelss.Stamina.Value >=5 then
        if not en then return end
        if char:FindFirstChild("ForceField") then return end
        -- put exp change here and stuff
        play.Levelss.Stamina.Value = play.Levelss.Stamina.Value - 5

        en = false
        --throwing = true
        throwing = true
        animate()
        --[[
	infront = root.Position + (root.CFrame.lookVector * 2) -- 2 studs infront of the player
		z = game.Players:GetChildren() 
		for i= 1, #z do 
			if z[i] ~= play and z[i].Character ~= nil and z[i].Character:findFirstChild("Torso") then
				enemy = z[i].Character
				if (root.Position - enemy.HumanoidRootPart.Position).magnitude < 3 then -- in range of an attack
					attacker(enemy.Humanoid)
				end				
			end	
		end ]]	
        throwing = false
        wait(0.1)
        en = true
end
end)

function knockback(humanoid, point)

    kp = Instance.new("Part")
    kp.Transparency = 1
    kp.Name = "PuncKnockback"
    kp.FormFactor = "Custom"
    bv = Instance.new("BodyVelocity")
    bv.maxForce = Vector3.new(1e8,1e7,1e8)
    bv.velocity = point.Velocity + ((point.CFrame * CFrame.Angles(math.rad(-90),0,0)).lookVector * 4)
    print(point.Velocity)
    bv.Parent = kp
    kp.Size = Vector3.new(0,0,0)
    kp.CFrame = humanoid.Parent.Torso.CFrame
    weldTogether(kp, humanoid.Parent.Torso)
    kp.Parent = humanoid.Parent.Torso
    game.Debris:AddItem(kp, 0.1)
end
function touchy(point, part, hit)
    if not hit then return end
    if not throwing then return end
    if not p then return end
    if part ~= attack then return end
    p = false
    humanoid = nil
    if hit.Parent:findFirstChild("Humanoid") then
        humanoid = hit.Parent.Humanoid
    end
    if hit.Parent.Parent:findFirstChild("Humanoid") then
        humanoid = hit.Parent.Parent.Humanoid
    end
    if humanoid and  not humanoid.Parent:findFirstChild("IsAShip") then
        if humanoid.Parent:findFirstChild("ForceField") then p = true  return end
        attacker(humanoid)
        if humanoid.Parent:findFirstChild("UpperTorso") then
            knockback(humanoid, point)
        end
    end

    wait(0.2)
    p = true
end



crzk = false
function OnEquipped(mouse) -- select tool
    idle:Play()
    Tool.Handle.Crack:play()
    equipped = true
end
function UnEquipped(mouse) -- deselect tool
    idle:Stop()
    unequipped = false
end
hum.Jumping:connect(function() -- jumped
    jump = true
    tim = game.Workspace.DistributedGameTime
end)
hum.Running:connect(function() -- stopped jumping
    jump = false
end)
hum.Climbing:connect(function() -- stopped jumping
    jump = false
end)
Tool.Equipped:connect(OnEquipped)
Tool.Unequipped:connect(UnEquipped)