The news of Elder Yin's death reached Elder Ji Xing in the military tent very quickly. Everyone in the Demon Hunters Association had a soul mark which would instantly disappear when a person was confirmed dead.
Elder Ji Xing was no exception.
When Elder Zuo Wu died previously, President Bai had directly turned to leave even without confirming Elder Zuo Wu's death precisely because he had clearly sensed the disappearance of the soul mark. But it wasn't as if it was permanent. This soul mark was a once-off; neither President Bai nor Elder Ji Xing could have expected Elder Zuo Wu to later come back to life on the spot.
Not only could the Soul Suppression Ring reconstruct the body, it could even perfectly restore the soul, which meant remaking the state of Elder Zuo Wu's soul. Therefore, when Elder Zuo Wu was resurrected, the soul mark in his body also disappeared.