To be fair, the moment the little puppet Hu Li uttered the phrase "Unity of Heart and Mind", Yu Sheng felt it was quite difficult, mainly because most of the time he spent with Erin was when both thought the other was crazy—but he then gave it some more thought, if both of them considered each other crazy, wasn't that, in a way, a form of Unity of Heart and Mind as well?
His train of thought unconsciously expanded, veering off so far in just a few seconds that he barely recognized it, until Erin smashed her forehead into his: "I told you to empty your mind! Not let your mind wander off! At least focus on opening the gate—"
"Ah, yes, right."
Only then did Yu Sheng snap back to attention, quickly gathering his thoughts and began to earnestly execute the steps to open the gate.
But this time, he only summoned a "Void Gate" that led nowhere, and while maintaining the stability of the gate, he slowly relaxed his mind.
He felt Erin's small hand pressing on his temple.