While analyzing Presia's intention to transfer to the Rose Iron Prison, Aiden had already considered the possibility that after repeated setbacks, Presia had set her sights on him, especially since he had now confirmed that she possessed a deadly weapon capable of "possessing" others.
Putting himself in her shoes, Presia's situation was actually quite difficult. She had lost the "credential of the Great Witch," and was also unable to break away from the Heretic Judgment Bureau to rescue Daili from the Rose Iron Prison.
If Aiden were in her position, holding the weapon of possession, there were two methods he could think of.
One was to find a random person to switch bodies with again, and then directly flee Silvertown to disappear without a trace—two consecutive body swaps would almost certainly mean a leak of her magical information.
The other was to take a gamble and find an opportunity to take over the body of the warden of the Rose Iron Prison, rescue Daili, and then flee.