When I was reading the novel, it was quite different with how it went. If I remember correctly, in the novel Bastard Cain managed to slap Aria and held a rope trying to tie Aria in her room, and after Bastard Cain slapped her and saw the rope, Aria was so shocked that she was reminded of her past trauma. But before Bastard Cain was able to tie Aria, the Imperial Soldiers arrived in time. (Though I'm not sure if what I remember is as accurate since its been a long time and I'm just re-reading everything)