uchiha`itachi

well the only way that yondaime is able to use the body flicker r the seals that he have made and each of his special kunai's have those seals on them like he did in the naruto gaiden wen kakashi was lil and yondaime was his sensai like see he gave his special kunai's with the seals like they r heavier than an usual kunai cuz its different shape. also in the gaiden he told like a group of like what 5 ninja's that were being attacked by someother shinobis and they had to chance in winning until yondaime can and he told the group to throw those kunais over and once they landed he killed them all and then same with kakashi wen kakashi was being attack by like 3 other ninjas kakashi throw it and i guess what diane said teleport over to wherever he feels this kunai being used. well wen kakashi threw it the seal on it alerted yondaime and he killed them i guess he and feel wen the kunai is being used cuz i think he made them and they might have like charka in them and then the seal allow him do the body flicker but i forgot to mention i think there r 2 seals to the body flicker:
1. the seal that allows yondaime use the body flicker
2. the seal that alerts yondaime and allowing him use the body flicker as well