King Dimitri escaped unharmed.
No, he was not running away.
Instead, he confidently stepped over Raphael's body which was now lying on its back helplessly full of wounds. He probably had Demon DNA and could completely control himself. But King Dimitri, apparently also had the same Demonic DNA as him. What was different was, he was much stronger and defeated Raphael without any significant struggle.
The mysterious king, despite having dozens of elite knights escorting him, was not a weak vampire. He had been hiding his powers all along, to outwit the likes of Raphael. They thought king Dimitri was in power because of his lineage, wealth, political support and being surrounded by the strongest people of Avalon. Turns out he was more than that.