Magnitude showing up as 0?

I was playing around with this script and hoped to make a boss battle script out of it somehow, and I'm doing decent so far. Basically, I have a textbutton teleporting you to the boss in an arena, and I was hoping that if the player was in a certain range of the boss, the boss would attack and music would play. The problem is that the music starts playing as soon as I spawn, even though the boss is extremely far away. I added a wait to the PlayerAdded function, and the music played when I was in the arena, but it also played when I was extremely far away from the boss as well. I decided to print the magnitude of the boss' torso position - the player's torso position, and it always prints 0, no matter where I am.

The script:

function ShootingStar(plrtorso,plr)
	
	while true do
		
		
		local Star = game.Workspace.Fire:Clone()
	Star.Name = "SunComet"
	Star.Anchored = false
	Star.CanCollide = false
	Star.Parent = workspace.MagicParts
	Star.CFrame = script.Parent.Torso.CFrame +Vector3.new(0,0,-6)
	Star.SunExplosion.Enabled = false
								
	local bv = Instance.new("BodyVelocity")
	bv.Parent = Star
	bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
	bv.P = 800
	
	
	bv.Velocity = (plrtorso.Position - script.Parent.Torso.Position).unit*50
	
	
	
	
	
	Star.Touched:Connect(function(hit)
		
		Star:Destroy()
		
		local Sun = Instance.new("Part")
		Sun.Parent = workspace.MagicParts
		Sun.Material = "Neon"
		Sun.BrickColor = BrickColor.new("Deep orange")
		Sun.Position = Star.Position
		Sun.Shape = "Ball"
		Sun.Size = Vector3.new(0,0,0)
		Sun.Transparency = 0
		Sun.CanCollide = false
		Sun.Anchored = true
		
		local SunPE = game.Workspace.Fire.SunExplosion:Clone()
		SunPE.Parent = Sun
		SunPE.Enabled = true
		
		for i = 1, 30 do
			
			Sun.Size = Sun.Size + Vector3.new(2,2,2)
			Sun.Transparency = Sun.Transparency + 0.05
			
			
			wait()
		end
		
		local h = hit.Parent:FindFirstChild("Humanoid")
		local pv = hit.Parent:FindFirstChild("PlayerValue")
		
		if h ~= nil then
			
			if pv ~= nil then
				
				
				if pv.Value == plr.Name then
					
					h:TakeDamage(0)
					
					
				end
				
				
				
			end
			
			if h~=nil then
				
				
				if pv == nil or pv.Value ~= plr.Name then
			
					h:TakeDamage(3)
					 
				end
				
			end
			
		end
		
		
	game.Debris:AddItem(Sun,5)
	
		
	end)					
								
	game.Debris:AddItem(Star,10)	
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		wait(40)
		
		
		
		
	end
	
	
	
end



game.Players.PlayerAdded:Connect(function(plr)
	repeat wait() until plr.Character
	local char = plr.Character
	
	wait(10)
	
	
	local torso = char.Torso
	
	local theos = script.Parent
	
	local PV = Instance.new("StringValue")
	PV.Name = "PlayerValue"
	PV.Parent = plr.Character
	PV.Value = plr.Name
	
	dist =50
	
	local body = game.Workspace:GetChildren()
	for x = 1,#body do
		local temp = body[x]
		if temp.ClassName == "Model" and temp ~= plr.Character then
			local hum = temp:FindFirstChild("Humanoid")
			bod = temp:FindFirstChild("HumanoidRootPart")
			if hum ~= nil and hum.Health > 0 then
				if bod then
					if (theos.HumanoidRootPart.Position - bod.Position).magnitude < dist then
						person = temp
						
						if person ~= nil then
							local b = (bod.Position - theos.HumanoidRootPart.Position).magnitude
							print(b)
							
							
							local Sound = Instance.new("Sound")
							Sound.Parent = char.Torso
							Sound.SoundId = "rbxassetid://622902771"
							Sound.MaxDistance = 300
							Sound:Play()
							
							ShootingStar(torso,plr)
				
						end
				
					end
				end
				
			end			
		end
	end
end)