Su Xueyi doesn't elaborate further on what the 'Soul Summoning Technique' entails, but Xi Zirui can make an educated guess.
The worst part of the whole thing is that instead of the evil-villain monologue Xi Zirui mentally prepared himself for, Su Xueyi just smiles cryptically in the face of Xi Zirui's questioning look.
"Shidi must be tired," he says, getting up from the table with a graceful flurry of robes. "I'll have rooms prepared."
"That's not necessary, I'll retire to my own quarters," Xi Zirui says, getting up from the table as well.
Su Xueyi stops him with a hand on his shoulder. "That wouldn't be a good idea." His smile grows jagged at the edges. "Considering Shidi's recent indiscretion, I believe it would be best if he stayed here. Where I can ensure he won't shame himself and our sect again."