I've touched base on that too...I think we were going through the scenarios of what might happen but him sleeping with Kwan isn't one of them because of Sila himself. So, they have 3 options...have someone sleep with her thinking it's him, have her chase him around like a puppy and finding out he's Tor and she would feel ashamed for doing so or Sila see how much it hurts Minta and forgo his revenge on Kwan.
I don't know how it is in the book but Sila's revenge on Kwan is a bit misguided. Yes, she insulted him and such but Sida almost killed him so his gripe would be on her the most...yet there's this weird obsession in him wanting to hurt Kwan. But I guessed, it propelled the storyline of Minta and Sila...anyhow, I don't care what happened much to Sila and Kwan. Once the sleeping part is over hopefully her story gets pushed to the back burner. I need them to hurry up and get to the willing