In your opinion, what do you think ran through Chase's mind when Omi snuck all the way to his castle alone to break Chase out of the Sphere of Yun?
Oh gosh. This one made me think. 😆
Okie. So, I figure there are 4 main avenues Chase's mind could have gone down.
1. He was actually already expecting Omi. There's a moment where it looks like he looks at Omi right after he's been captured. That could have been him trying to cue Omi that this would be a good time to repay the favor. It would also be an easy explanation for why he wasn't surprised by Omi coming.
2. He wasn't surprised by Omi coming, but he was gratified by it. It would indicate a preference for Chase over Jack. The fact that Omi clearly snuck away to rescue Chase would also indicate that Omi is loosening his morals a little bit. Not enough to even remotely think he's coming to Chase's side, but I think Chase would definitely see it as a good first step to making his protégé heylin.
3. Chase actually was surprised, but he's been around for 1500 years; no way he doesn't know how to hide that. I don't think he cares to, because why bother hiding from insignificant insects, but I do think he wants to be put together in front of Omi. (Probably look cool too.)
However this would be a good surprise, and Chase is perfectly capable of rolling with the various turns life likes to dish out.
4. He wasn't surprised, and he was glad about it. Because Omi coming to rescue Chase shows a significant portion of his character, regardless of if it's because he was simply returning the favor, or because of how Jack was pummeling them. And the more knowledge Chase has of Omi, the easier it (theoretically) would be to turn him.
In all of these scenarios, while I think that Chase had already determined that he wanted Omi by his side, this episode twigs me as the moment that Chase decides that he won't stop until Omi takes his rightful place by Chase's side.
That he views Omi as his: his protégé, his to-be co-ruler.
I honestly think that Chase initially makes Omi his second in command because Omi is a kid (not to mention good), and not actually ready to be a ruler. And that the reason he made Omi into a cat was so that he could ensure Omi stayed by his side.
Once Omi is fully heylin, of his own choices rather than the ying yo yo, and he had actual life experience, I do think Chase would have changed him back into a human and that he would have had Omi take his place by Chase's side rather than as his second.
So yeah, while other episodes established that Chase wanted Omi to rule the world by his side, I think this is the episode that establishes why Chase never tries to kill Omi. Even when it becomes apparent that Omi isn't gonna join him. (At this time at least. )