Even though there was something to be feared from a Blood Servant arranged to follow his superior's commands—they were at a strength beyond that of an ordinary human and could wreak havoc and destruction, nothing bad happened.
Walter did not destroy Felhker Village.
It was a decision that would supposedly bring him to utter harm since he opposed his Master's decision—but the man took note of the Vampire Lord's wordings.
The slightest suggestion that he could skip it because Cassius' exact wordings were like this:
"Alright, I suppose Felkher Village should be destroyed now that it has served its purpose. Or those who you questioned about the Paladin Order."
Suppose.
Just one word and yet it allowed Walter to spare the entire village from utter devastation—he did not know why it felt good.