Even though there are more strainful nights that he experienced in his life, tonight was by far the most frustrating one as everything that he does gets completely negated or acts as if it was a joke by the person that shamble his entire plan.
Arnulf was completely overwhelmed by the sheer amount of surprise of this cursed night.
It's a night of surprises after surprises that puts even a hardened veteran like him dizzy from the number of times he felt like his entire view of the world has been shattered, Rex seems like always a step in front of him.
Despite feeling that he was about to win, there's always something that pushes him beyond.
Double King Mark and the Countess of the Dark Luniric are by far the greatest surprise of the night, but now something matching that happened to him. Arnulf looks down and finds Rex's claws managed to reach him even though he's inside the Twilight Dimension.