As everyone grew closer and formed bounds, Yoze sneaked out to return to his room as he couldn't wait to continue trying to fuse his spiritual energy with his blood. He had been attempting this fusion ever since he fought the Leopard demon but till now he had made little progress.
He had been experiencing the same difficulties with manipulating his spiritual energy as when he tried to enter Martial Silver Thunder's body. He could manipulate his spiritual energy to do basic movements like moving it to cause spiritual suppression or form spiritual claws
But doing more complex and intricate movements and techniques was incredibly difficult to do without a wave of pain being inflicted on his mind. There was also the issue that Yoze couldn't figure out how to solve and that was the conflicting nature of his spiritual energy.