Responses
Nope not just his acting job but him as an agent/vampire killer. I feel that after knowing the truth, he'll be conflicted in doing his missions as an agent especially killing the vampires and may also lost the trust of his boss or worst case he'll be used as a bait to lure Ethan (even though he doesn't mean any harm in the society at the moment, still he's a vampire so...).
Now I wanna know as to why he's a vampire killer. It seems it's Tristan who has a lot to lose here- both his job and Ethan.