Because when Ji Tianqi was "crossing," his projection could sense crises in the real world and respond to them accordingly.
It could also be said that when Ji Tianqi was experiencing an episode, he was able to effectively respond to any crises.
Therefore, such tests were necessary. As long as the testing was successful, Ji Tianqi would be able to go on a killing spree in the Otherworldly realm, even using modern thermal weapons.
"Let's first test movement after crossing," Wu Ya explained, "Compared to movement before crossing, the likelihood of success is much higher."
Being able to leap onto a treadmill within the No. 9 Training Ground and even practice Void Horse Riding, Ji Tianqi's movement prior to crossing had long been proven not to affect his ability to cross.
Impressive, his Qinggong had improved even more, allowing him to traverse from the Deserted Island and abandoned drilling platforms, crossing the ocean to return to land directly.