After arriving at where Mr. Acacia was, Luciel controlled the vines that he had used before and raised them again by stimulating the remaining energy that was still inside the vines.
He also asked Thorn and Sun to just stay put beside Mr. Acacia, as they still couldn't help in the current situation.
If they were fighting land-dwelling animals and zombies, then he might have let them out; unfortunately, they weren't.
So Luciel could only leave them behind because they couldn't help in the current situation, as the reach of their abilities wasn't that high yet, so they weren't that effective.
He also had to continuously move around later, so he couldn't watch over them if they joined him; it was better to just leave them with Mr. Acacia.
After Luciel finished erecting the cover at the place where Mr. Acacia was, he brought out five more vines from his space and put them on his wrist.
