Chapter 32..Too all confused.. I will explain with my own understanding

Okay.. Now Sid enters the scene...
Sid is kinda dumfounded that he saw the doctor, Aaron... And the companion of Aaron recognized Sid as Cain's right hand man.. (sorry do not know the name)

Because when you read back chapters before this.. Sid asked the compass (pendant like thing) from Cain which Cain gave to him cause he still trusts Sid.
Sid then asked another demon to locate the doctor and kill him in which Sid gave Cain's compass to that demon (cause I do not know his name sadly) . Which the assigned demon showed into a pet shop and killed the doctor...
Since the killed clone did not give any information any longer... that demon presummed the doctor to be killed....

And then after being dumbfounded... Cain asked Sid of the whereabouts of the doctor and Sid told Cain that the doctor is dead...

This puts Aaron in a tight spot.. Since Sid is still the right hand man of Cain.

......So the thinking wars begin.....
In aaron's perspective... Before Sid came in.. He is on verge to convince Cain he could help him..
So now that Sid is here... He is already getting the flow of scenario into his head. That Cain has no idea about the doctor. Also Cain is not that of a trusted demon because of his connection with Sid. But he knows Cain is looking for him and Sid is a snake!! (since Sid wants him dead)
.. So he is now thinking of what he will do since Sid falsely reported to cain and he is still being trusted by Cain. He is thinking of rebuking Sid but that might not do him good and he thinks of another scenarios as well.. And he also said the reason of him wanting to side with Cain..

On the other hand.. Sid is thinking of why Aaron and his companion is not pleading.. Since he knew Cain still believes in him.. He could just tell Cain that they are enemy of some sort..

So.. It is up to Aaron on how he will explain things to Cain.