Feng Jun explained things to Teacher Mei until four in the morning, taking into account that Xiao Caixin was staying in the courtyard.
As for Gazi? He was cultivating by the Spirit Gathering Array near the small lake at night. In his words, he was "helping Uncle and Aunt keep watch over the place."
Feng Jun had even set up a defensive formation around that Spirit Gathering Array, so there was no need to worry about mosquito bites. However, the spiritual energy there couldn't compare to the array in the small courtyard, as most of the energy was being drawn away by the courtyard's array.
Still, it was more than enough for Gazi's cultivation, and he trained with relentless intensity; pulling an all-nighter was nothing to him.
Feng Jun tiptoed out carefully, but he was instantly taken aback: Hmm? Why is Xiao Caixin cultivating in the courtyard? Wasn't she asleep?