There was nothing the three vampires could do to get even, even if they were aware that Caius had done it deliberately.
Along with that, it was an unshakeable fact that only Caius could make those Shadow Guards move. This was the reason why he did not fight back when he was taken away from his tent and transported to the battlefield.
It was also at this location that he (Micah) met both Alex and Number Ten. Since he and the other two vampires were present here, the only sure tight protection for Venera would only be left to Caius (and Number Eleven).
"Do not casually address His Majesty by his name." Number Ten uttered this sentence in a stern voice; the expression on his face was cold.