At this moment, Ling Lan didn't relax even though the silver sand had been successfully deposited in their respective points. Instead, she prepared herself for the incoming recoil the hardware was generating.
Little Four's learning device wasn't the average learning device, to begin with. Thus, the process of upgrading it wasn't also a normal process too. The recoil generated during an upgrade was enough to devastate a normal person. Only people with exceptionally strong spiritual power would be able to endure such recoil. Even so, the price they had to pay to endure such torment was not to be slighted either.
However, this amount of recoil didn't put pressure on Ling Lan as she had the spiritual cultivation of the Divine Command sect which was already close to god-realm.