From this I am guessing that your door has an electric opener. Doesn't it have the obstruction setting that will stop it if it hits anything above the floor? Mine is adjustable and I had to adjust it as I had it so sensitive that just then rubber seal hitting the floor would cause it to go back up. also the newer ones have a light beam across them at a set level and anything breaking it before the door is closed will cause it to reverse and go back up.
You Cobra sure is taken care of. If mine had that much work and care on it, I am sure it would figure I had sold it.
Ron