[He looks towards the river and tries to gather his memories.]

It was when I was fighting Ozai, and he had me cornered. I was able to repel his fire with Earthbending, but he was quickly overpowering me. And... when he pushed me back some jagged rock got caught in my scar. That... it kinda fixed that chakra I guess. It's so hard to describe, but... suddenly the Avatar State was... it was like it was restarting again.