If Mrs. Chester was a scorpion-tailed snake, Hubble was a lion with a bear's claws.
No matter how sharp the sword was, it was less lethal than a plain wood sword if one's goal and path were uncertain.
Her explicit and urgent attack could not penetrate his thick skin.
Besides, Hubble was even waiting to be attacked in this obvious way. Just like he did with Ober, he did not have any intention to conceal his tricks even to Mrs. Chester.
On the contrary, he wanted Ober and her to clearly see the blade of his sword and voluntarily feel pressured enough to follow him.
He wanted them to realize who had been moving to change the giant continent ranging from Aslan, Faisal, Sorman, and the now-defunct Lennox into a game board.
He wanted them to realize how many choices he still had and how easy it was for him to discard one of them.