Princess Becomes Henry's Follower
After dealing with the magus guard, Henry stayed in Lalaminea's room for the next few days.
He took this step very seriously. He didn't let anyone in. The guards, the maids, the butlers, and visitors. All of them were unable to enter.
Everything that Henry did may seem forced, but he had other plans. He wanted to see if he could use Lalaminea to attack the Grand Human Unification Alliance. The quote was one of the reasons— that was true, but it wasn't the major one.
Henry needed to gain a foothold in this world. The fastest way would be to use someone with political power. Although Lalaminea didn't exactly fit that criteria, it was possible to regain her power if he put in some effort.
In other words, Henry was playing the long game by keeping Lalaminea alive and pulling her into his influence.
Meanwhile, Henry's deeds spread to the whole manor. Everyone involved with Lalaminea wanted to know what was going on.