3DMG - Having problems with a repeat function - Any help?

Hey, guys.

I'm making a 3DMG from Attack on Titan, however it seems that my script is not working. I've scattered prints all over it and it seems that it won't come out of the repeat loop properly when the key comes up. Here's my script: Player = game.Players.LocalPlayer Mouse = Player:GetMouse() Torso = Player.Character.Torso UpdateGrapple = false Speed = 50 debounce = false

function Grapple(Location, MTar)
	if MTar == nil then return end
	Player.Character.Humanoid.Died:connect(function ()
		Container:Destroy()
		if Torso:FindFirstChild("RocketPropulsion") ~= nil then
			Torso.RocketPropulsion:Destroy()
		end
	end)
	Container = Instance.new("Model", game.Workspace)
	Container.Name = Player.Name.."Container"
	print("Firing grapple!")
	loc = Location.p
	distance = (loc - Torso.Position).magnitude
	print("Defined variables")
	Target = Instance.new("Part", Container)
	Target.Name = Player.Name.."Target"
	Target.Transparency = 0
	Target.Anchored = false
	print("Made target")
	W = Instance.new("ManualWeld", Target)
	W.Part0 = Target
	W.Part1 = MTar
	W.C0 = CFrame.new()
	W.C1 = MTar.CFrame-MTar.CFrame.p
	print("Welded target")
	Target.CFrame = Location
	RP = Instance.new("RocketPropulsion", Player.Character.Torso)
	RP.CartoonFactor = 1
	RP.Target = Target
	RP.MaxThrust = 10000
	RP.MaxTorque = Vector3.new(3000, 3000, 3000)
	RP.MaxSpeed = Speed
	RP:Fire()
	print("Made and fired RP. Starting the wire sequence")
	repeat
		Wire = Instance.new("Part", Container)
		Wire.Name = Player.Name.."Wire"
		Wire.BrickColor = BrickColor.new("Really black")
		Wire.Transparency = 0
		Wire.Anchored = true
		Wire.CanCollide = false
		Wire.TopSurface = Enum.SurfaceType.Smooth
		Wire.BottomSurface = Enum.SurfaceType.Smooth
		Wire.formFactor = Enum.FormFactor.Custom
		distance = (loc - Torso.Position).magnitude
		Wire.Size = Vector3.new(0.2, 0.2, distance)
		Wire.CFrame = CFrame.new(loc, Torso.CFrame.p) * CFrame.new(0, 0, -distance/2)
		wait()
		Wire:Destroy()
	until UpdateGrapple == false
	print("Wire sequence ended.")
	print("Unlatched!")
	Container:Destroy()
	RP:Destroy()
end

Mouse.KeyDown:connect(function (Key)
	if Key == "q" then
		UpdateGrapple = true
		Grapple(Mouse.hit, Mouse.Target)
		print("Latched!")
		Mouse.KeyUp:connect(function (Key)
			if Key == "q" then
				UpdateGrapple = false
				print("UpdateGrapple been set to false")
			end	
		end)
	end
end)

Basically you press Q, it shoots the wire and activates the RocketPropulsion object to send you towards the desired point, and starts updating the wire in real time so it looks like you're reeling it in. When the player releases Q, the requirement to stop the loop is met and it stops updating and deletes everything. Any help appreciated.