Now that the two were armed with weapons that could be used against the Knights, both Shiro and Nan Tian started to clear them out quickly. The portals that had originally opened by the summoning circles had been closed and the Knights had no way to escape.
Even though Shiro wanted to use the portal to reach the other side, she knew that there were too many uncertainties around the other side of that portal. If she goes without adequate preparation, it'll end very badly.
While she may have said safety was an option, she still needed to be careful.
Plus, there were plenty of subjects here for her to experiment on. With Nan Tian making a suit of armour, she could use that as a basis for her nanobots and research on some Knights on the side to speed up the progress. With that in mind, she couldn't kill the rest of the Knights since she needed all the Knights she could capture.
Summoning Iriel once more, Shiro could hear him complain.
