The sword sparring between Francis and Roosevelt was held two weeks after I proposed it. Seems like Rosaline and Duke Ashford considered this sparring as a good opportunity to show who Roosevelt really was. They wanted to show that Roosevelt was the best prince in the empire.
That afternoon, a lot of nobles came to watch the sparring, including Duke Gardson. This was another reason to show Roosevelt's skill. If Roosevelt performed well, then his supporters would increase.
The Ashford family also would eliminate Francis in this sparring by poisoning him. The poison used was the one made from drugs from the Helsa Kingdom. Even though the research about this poison hadn't been done yet and it was so slow to show its effect, it was so strong. Until it was used that day, a single drop of it could kill an ordinary person within three hours.