Yuya knows he should be in bed anyway, he just refuses to.

"Well.." Yuya brings a hand to his chin as he gauges how to explain it. "Since I was willing to do the ritual, the angels didn't have to drain all my blood." It's so much more effective when the person being sacrificed it willing, incidentally.

"So instead, my soul was used as a catalyst with the power of the Earth spirit. It was going to be with the pendant, but because the spirit was in Peridot she was able to join the ritual in its place. So Yugo took Pru's sword, did some sort of ritual dance, and then stabbed us."