Rebecca couldn't keep calm after what she saw. Her family was not 100% clean and they had their own ties in the underworld.
She was sure that even if her parents saw Mary's change of eyes right now, they would be equally shocked.
The reaper is a well know name in the underworld. Sources say that the reaper is a woman and not a man as many presumed. It is said that whoever came across her wrath does not see the next day.
It is also said that her eyes become red once she gets angry or when she is about to get done with her prey.
Rebecca couldn't just relax, what she just saw was exactly what she has been hearing all these years.
If Mary is really the reaper, what kind of life has she been leading? Who sent her to the orphanage?
The woman's mind was not restless, she felt like her mind was about to burst, they have been stuck in solving Emily's mystery but now there is also Mary's mystery and her relation to the reaper, to the underworld.