Nine_Clouds
so he have memories from his Ninja life right so he should at least know the academy basic ninjutsu right...
If I remember right, twin spirits happens when both spirit essences are equal to each other.... Otherwise one spirit will devour the other and be dominate or mutate the spirit. This should be true with triplet spirits too. So that handkerchief got some super special secret to it, much like Tang San's Blue Sliver Grass did.