I can't put anything after "until"?

I'm trying to put a debounce and a part:remove() but it just wont' work because of my looping script. how can i make it so I can put a debounce and a part:remove() without interfering with the looping script?

local tool = script.Parent

local debounce = false

a = 0

b = 0

c = 0

local character = game:GetService('Players').LocalPlayer

local player = character.Character or character.CharacterAdded:wait()

tool.Equipped:connect(function(mouse)
    mouse.KeyDown:connect(function(key)
        if
            key == "e" then
            a = 0
            b = 0
            c = 0
            print ("INvisibruuuuuuuu")
            debounce = true
            local part = Instance.new("Part")
            part.Shape = Enum.PartType.Ball
            part.Transparency = 0.6
            part.BrickColor = BrickColor.new("Royal purple")
            part.CanCollide = false
            part.Anchored = true
            part.CFrame = CFrame.new(player.Torso.Position)
            part.Parent = game.Workspace
            wait(2)
            part:remove()
            repeat
                part.Size = Vector3.new(a,b,c)
                a = a +.5
                b = b +.5
                c = c +.5
                wait(.1)
            until
            part.Size == Vector3.new(10,10,10)
        end 
    end)
    end)

the looping script is making the sphere bigger, but if i put a debounce after the:

until part.Size == Vector3.new(10,10,10)

then it won't stop making the sphere bigger until the deboucne is == false and the part is removed. Please help, this is my ideal code:

local tool = script.Parent

local debounce = false

a = 0

b = 0

c = 0

local character = game:GetService('Players').LocalPlayer

local player = character.Character or character.CharacterAdded:wait()

tool.Equipped:connect(function(mouse)
    mouse.KeyDown:connect(function(key)
        if
            key == "e" then
            a = 0
            b = 0
            c = 0
            print ("INvisibruuuuuuuu")
            debounce = true
            local part = Instance.new("Part")
            part.Shape = Enum.PartType.Ball
            part.Transparency = 0.6
            part.BrickColor = BrickColor.new("Royal purple")
            part.CanCollide = false
            part.Anchored = true
            part.CFrame = CFrame.new(player.Torso.Position)
            part.Parent = game.Workspace
            wait(2)
            part:remove()
            repeat
                part.Size = Vector3.new(a,b,c)
                a = a +.5
                b = b +.5
                c = c +.5
                wait(.1)
            until
            part.Size == Vector3.new(10,10,10)
        end 
wait(2)
debounce = false
part:remove()
    end)
    end)