Shingi and Soren made their way toward Aella and their possessed opponent. On the way, Soren used a Spell to pass pieces of knowledge on Shingi without speaking. What they contained was, of course, the plan for helping repair the soul of the female mage.
The plan didn't have many steps. First they had to access her inner place, and examine what damage had happened in it, and then to use their Spirit Element to fix it. In theory, it sounded simple, but every step contained its challenges.
Entering your Inner Place took weeks, months, or even years for people to learn how to do so normally. Accessing someone else's Inner Place was even more challenging, as they varied by each individual, so entering it wasn't the same for all of them.
Of course, they could force their way in, but that would cause more damage, which could even lead to her death before having any chance to fix anything.