Seeing that his opponent was Anti-Psion Knight, Arcturus knew that he needed to completely adjust and change his battle strategy towards Jeniael, or else he would lose the sparring match.
Her swordsmanship was also very superb; from what he could tell, she was training in combat since she was little and had very strong talent and aptitude towards it. It was no wonder that weapon mastery was the only thing that remained for her.
In fact, she was in a rather particular position and diidn't have many other options for getting stronger because her Psyker Ability, while being at the Super-High Risk Grade, wasn't something that gave her high combat prowess out of nowhere.
Due to this, Jeniael needed to go through a lot of hardships to achieve the combat prowess that she had right now.