i was rewatching some old eps around eps22 and i noticed when lee first kicked sasuke in his face he did a hand seal.... and when the chuunins did an unofficial test for the genins.. he caught sasuke's kick and sasuke said whats this chakra in his hands or arms.......so my question is why did lee do a hand seal and in what way does he uses his chakra if supposedly he doesn't use any and its pure taijutsu which is like the one in our world...