I was confused because you said they were attacking your Sim. Sparring wouldn't be attacking.
The Vampires that are sparring with your Sim are the townies (not your own playable Sims) correct? I shouldn't have said NPC, townie is what I really meant. I've never had a Vampire I'm not playing start the spar (at least not that I can remember), normally I need to choose the action. So, the (not your playable) Sim starting the spar seems odd to me. "Hunt" was more of an expression for finding them to spar with.
Sorry to confuse you.
