breath of all things isnt flowing haki. breath of all thing is the ultimate connection between swordsman and the sword which allows sword to cut only those things that swordsman has intention to cut. you think ryuo wouldnt cut the leaf coz as far I can remember zoro used the same force on striking those leaves as the force he used on the rocks. but it didnt cut the leaves but destroyed the rocks
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zoro said,"So, thats the strange haki luffy learnt from old man hyo" keyword being "Strange Haki"