I thought the top guy needs to work to improve his position. Whether that be working for a break down or near fall points.
Sitting on the ankle to me is like throwing in the legs when the guy stands up and is looking for a stalemate. Do it once stalemate do it twice stalling. If neither wrestlers position improves when sitting on the ankle call stalemate or stalling. 30 seconds in the same position for me as a spectator is boring. It should be called the same all match not just in overtime. I see more officials who tend to make these calls quicker in overtime and they should have called it earlier in the match. Which in turn would have forced continued action in regulation - possibly eliminating overtime. Use the move to your advantage or lose it - change it up. On the other side of this coin - the guy on the bottom let his foot get hooked - do not blame the officials for that. I would suggest to my wrestlers if the official doesn't see it that way you had better find the edge and get a fresh start so the clock doesn't keep ticking. Be sure after a fresh start do not let him hook your ankle again. There are a few techniques that will definitely deter an ankle rider (sitting on it) from doing it again. Some of which can be extremely painful.