Shino reveals several kikaichū behind his opponent, which begin to wrap around them. At the same time, Shino sends more insects in a spiralling pattern. All the insects swarm at the opponent, damaging them, and then dispersing.
The kanji 簇 literally means "swarm", but "yajiri" means "arrowhead". In Japanese, "arrowhead" can be written with a kanji that is basically the kanji 簇 with the kanji for "metal" (金, kin).