How is this raycast script even working properly?

Today, I have been trying to experiment with raycasting and was trying to make a laser beam that points to the direction of the raycast and updates itself to point to the new direction whenever the part is turned. The origin of the raycast is the Part, and the direction is the lookVector of the part times 50 studs.

local function MakeRayVisible(ray)
	local midpoint = ray.Origin + ray.Direction/2
	
	local Attachment0 = Instance.new("Attachment", game.Workspace.Part)
	local Attachment1 = Instance.new("Attachment", game.Workspace.Part)
	local Beam = Instance.new("Beam", game.Workspace)
	Beam.Color = ColorSequence.new(Color3.fromRGB(170, 0, 0))
	Beam.Width0 = 0.2
	Beam.Width1 = 0.2
	Beam.Attachment0 = Attachment0
	Beam.Attachment1 = Attachment1
	Attachment0.Position = Vector3.new(0,0,0)
	Attachment1.Position = Vector3.new(0, 0, -ray.Direction.magnitude) --I don't know why it is backwards
	
	wait(10) --Why does it beam updating according to the parts direction even with this wait
	Beam:Destroy()
	Attachment0:Destroy()
	Attachment1:Destroy()
	
	
end

local part = game.Workspace.Part

while true do 
	local origin = part.Position
	local direction = part.CFrame.LookVector * 50

	local ray = Ray.new(origin, direction)

	MakeRayVisible(ray) --The while loop only restarts after the function is complete, which takes 10 seconds
	print("Ray updated.") 
end

The beam does change its direction based on the rotation of the part and it is working as it is intended. My question is however, how does this even work properly, can someone please explain how my code works for some reason?

I realize what's going on, the raycast itself didn't not change, the only reason the beam follows the rotation of the part is because of the attachments.