My regeneration script won't run?

It regenerates, but it never disables itself

model = script.Parent.Parent
local thing = script.Parent:WaitForChild("Value")

backup = model:clone()

thing.Value = "Yes"

function regenerate()

    model = backup:clone()
    model.Parent = game.Workspace
    model:makeJoints()

    thing.Value = "No"
    script.Parent.BrickColor = BrickColor.new(26)
    wait(30)
    script.Parent.BrickColor = BrickColor.new(104)
    thing.Value = "Yes"
end

function onHit(hit)
    if (hit.Parent:FindFirstChild("Humanoid") ~= nil) and thing.Value == "Yes" then
        regenerate()
    end
end

script.Parent.Touched:connect(onHit)