Some interesting development during the first half of episode:
1. In her flashback, Ranka's bother told her not to tell anybody that her singing attracted Vajra after pushing her to escape pod.
2. Ranks think she is responsible for 117th's destruction. Grace uses Ranka's guilt to persuade her to defend Vajra home planet against intruder (Frontier).
3. On the wreck of Global they found the script from Grace about "super-dimensional network", by inserting implant to fold quartz. They also found the medical record for Ranshe, shown that she gave birth to Ranka while infected with V-type virus, which confirms the power source of Ranka.
4. Based on the Grace's theory, it is possible to create galaxy-wide real-time nerve network by using fold quartz as the core. The network will be hierarchical, meaning there are nodes above the others, with the one super-node dominate all. But to archive that all creature will have to be implanted, Wilder realizes that Vajra will be used as the mean to get the submission, because it is so powerful human cannot resist. And Ranka is the key to command Vajra.
5. They sent their finding to NUN government, realized that they have face Grace alone since reinforcement won't come in time due to distance and bureaucracy.
6. They also found a letter to Dr. Mao, which says, "...decided to give Mother's erring as gift to daughter..."
...
I have to go to bed because my brain is fall asleep...
Super Ostrich