The partner he loved 1000 years ago, had gotten exorcist by jujutsu sorcerers...he memory pained and angered him. But now that his lover wasn't there anymore he had to move on so he did even if it was hard

Now in modern time he's In Shibuya, he finally has his true form, he was going on a killing spree in a building, He scoffs while slashing a curse killing it, while stading on the ledge "Pathetic."