Why doesn't the magnitude work at all?

local plr = game.Players.LocalPlayer
local char = plr.Character
local hum = char.Humanoid
local t = char.Torso

char.BSFolder.BallCount.Value = char.BSFolder.BallCount.Value + 1

local ball = Instance.new("Part")
ball.FormFactor = "Custom"
ball.Shape = "Ball"
ball.BottomSurface = "Smooth"
ball.TopSurface = "Smooth"
ball.CanCollide = false
ball.Size = Vector3.new(0.5,0.5,0.5)
ball.BrickColor = BrickColor.new("Really black")

local subject = Instance.new("Part")
subject.Parent = t
subject.FormFactor = "Custom"
subject.CanCollide = false
subject.Size = Vector3.new(0.1,0.1,0.1)
subject.BrickColor = BrickColor.new("Really black")
ball.Parent = subject

local w = Instance.new("ManualWeld")
w.Name = "Weldy"
w.Parent = subject
w.Part0 = t
w.Part1 = subject

w.C0 = CFrame.new(0,0,0)

local w2 = Instance.new("ManualWeld")
w2.Name = "Weldy"
w2.Parent = ball
w2.Part0 = subject
w2.Part1 = ball

w2.C0 = CFrame.new(0,0,2.7)


-- // 

for index, child in pairs(game:GetService("Players"):GetPlayers()) do
	if child.Name ~= plr.Name then
		
		print("Kappa1")
		
	if (ball.Position - child.Character.Torso.Position).magnitude < 10 then
		
		print("Kappa2")
		
	local ray = Ray.new(ball.Position - child.Character.Torso).unit * 10
	
	local ignore = game.Players.LocalPlayer.Character
	
	local hit, position, normal = workspace:FindPartOnRay(ray, ignore)
		
		end
	end
end




-- //





--==========================================

local angle = 0

while true do
	w.C0 = CFrame.new(0,0,0) * CFrame.Angles(0, angle, 0)
	wait()
	angle = angle + 0.1
end

--==========================================

I'm trying to get a raycast whenever a character that is not localplayer gets close to the "ball" part , which is rotating around the localplayer. And I can't get the magnitude to work.