Okay, there's two answers for the different moves:
- Investigation and the other info moves should apply to whatever you are hunting. I may go and change the wording to "creature" in those, just to make that clear.
- Manipulating minions... well, that depends on the minion. Obviously, minions that the hunters can't talk to are out. And human minions can definitely be manipulated. Those in-between cases, vampire minions and so on, you should decide on a case-by-case basis. I would suggest that whenever the hunters manipulate something unnatural, what counts as leverage should be something terrible that the hunters will not want to be part of. E.g., "Sure, I will release this woman if one of you lets me drink your blood."