True there is a case for the intentional dropping ot a leg. Of course that is a completely different application than we are talking about here. Whenever, and wherever a wrestler finds himself on the legs of another he is obligated by rule to move up. He did it twice, he was told to move up, he didnt, he got penalized for it. That is a totally different deal then the intentional drop to a leg which is the rule you are citing. All the normal rules of stalling apply in a match. The rule you state applys to the technique of simply dropping to the ankle and holding on. Nobody is saying he did that, he was countering a stand up but that still does not relieve him of the responsibility of moving up. He still has to do that whenever and wherever he finds himself on the legs.