Karla kept telling me the events of everything that happened to them, and I was shocked to learn that Leslie's mother was still alive, thanks to Jackson.
Still, the vow they made only said that she couldn't kill the woman, so Leslie's mother was imprisoned further ahead in the dungeon.
Then, she told me about Yujun and how Karla was the one who had to fight the assassins since Jackson couldn't interfere with Vyrazul's plans or he would die.
The reason Jackson looked a little beat up in Leslie's memories after bringing Yujun home was because he couldn't fight back while the assassins were attacking him.
After saving Yujun, Vyrazul paid a visit to the outskirts again, and Jackson offered another demonic vow.
If Vyrazul allowed the kid to live, then he would let her take Jackson as a prisoner. However, Vyrazul wasn't that interested in having him chained up, expressing the fact that he couldn't mess with her plans anyway.