[HELP]Brick spawn being interfered with sword?

Okay so here is what i want to happen when i press the button 'F': http://imgur.com/leeZIAU this works fine, however when i press it with my sword equiped(so when its a child of the character) this then happens: http://imgur.com/QWsLK8D Here is the code for the brick spawn:

local mouse = game.Players.LocalPlayer:GetMouse()
local player = game.Players.LocalPlayer

function Ability()
    if player.Character then
        local Character = player.Character
                    local Brick = Instance.new("Part",game.Workspace)
                    Brick.CanCollide = false
                    Brick.Anchored = true
                    Brick.Size = Vector3.new(1,1,1)
                    Brick.BrickColor = BrickColor.new("New Yeller")
                    Brick.Transparency = 0.5
                    Brick.TopSurface = Enum.SurfaceType.Smooth
                    Brick.CFrame = Character.Head.CFrame
                        for r = 1,13,1 do
                                wait()
                            --Brick.CFrame = Character.Head.CFrame
                            Brick.Size = Vector3.new(r,r,r)
                        end
                Brick:Destroy()
        end
end

mouse.KeyDown:connect(function(key)
    key = key:lower()
    if key == "f" then --Change this to any Keys but I reccomand leaving it as [F] key.
        Ability()
    end
end)

I was wondering why this happens, espiecially as the sword is not collidable thanks for any help ~Bubs