The death toll was not catastrophic but it wasn't something that one could afford to ignore. That being said, the great Theon had made his presence known to save his disciple.
What else could the emperor do? Even if he wanted to blame Jiang Fei for killing his Highlord Advisor, could he really stand against Theon?
Being an emperor required having a great tolerance for many things. One also had to be able to forgive and forget. Theon had stopped the short archbishop and even let him go free. With that out of the way, Emperor Alistair had no other choice but to let this go. In his own words, "peace be with us all."
Jiang Fei himself had nothing to add to the table. Technically speaking, he had not consciously killed anyone. In fact, this entire matter had nothing to do with him. If there was someone to be blamed for all this, it would be Umbral Jiang Fei, although technically Umbral Jiang Fei was still Jiang Fei after all.