Even if the sudden appearance of the two Celestia Gods had taken him aback, Jason could roughly gauge what was going on.
They got wind of his blood awakening and wanted him to return to their home.
This could only mean that his blood awakening or something else about him was special enough to ignore the fact that he was a halfling.
However, instead of ignoring the other 'impurities' within his body, it looked like the Celestia Gods had been ordered to expel them by any possible means or to kill him as a last resort if that was not possible.
Choosing to destroy his soul world in order to cut off the beasts he bound to his soul would achieve this, which was likely to be the reason for Caesar's attack.
The emotions they showcased were restricted and only subtly noticeable if one were to exclude their disgust towards him as a halfling, who had tarnished the blood of their divine bloodline just by existing.
