SB 9.3.4
te daiva-codita bala
jyotisi kantakena vai
avidhyan mugdha-bhavena
susravasrk tato bahih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
As if induced by providence, the girl ignorantly pierced those two glowworms with a thorn, and when they were pierced, blood began to ooze out of them.