The gap between Zhuang Weiran and himself was much bigger than that of the Xu brothers. Even with just the heart-protecting spiritual energy left, it could cause a severe backlash to Feng Yin.
This was not a joke.
But dissipating the heart-protecting spiritual energy was like tying one's hands voluntarily and letting others butcher them. If it weren't for their close relationships with no reservations, Feng Yin would never have rashly made this suggestion.
"What's so difficult about that."
The couple looked at each other and smiled, then voluntarily dissipated their body-protecting spiritual energy, heart-protecting spiritual energy, and even the Dantian energy.
Boom, Boom!
The two acted simultaneously, knocking each other out.
Their trust in Feng Yin had long reached the point where they were willing to entrust their lives to him, let alone healing wounds.
