I wonder what Akira's condition is. He seemed pretty weak, unable to fight. Medis probably can fight after resting a little bit, but what does she count for? Calvina doesn't exactly look like she even remembers anymore that she was supposed to be Medis and Akira's bodyguard. Her other mission claimed all of her attention. Medis seems to think the king of Pansylvenia would rather try to wash his hands and appear innocent, but at the end of the day, the king isn't the greatest power in a country that's cooperating with the singularities. If those singularities decide to do something, the king can only try to come up with excuses and explanations to save his own skin. Akira and Medis's only hope is that the singularities don't really like to make public appearances, instead they rely on their minions whenever possible.
Also who knows what the singularities really want. Akira might be far too interesting for them right now to do anything hasty. After Akira displayed powers the singularities themselves would be incapable of, it's possible they want to only observe for the time being.