They're already cautious- one of them is rash, but the other one isn't.
The red winter himself kept his allies on a distant leash, Assassin has never been able to give information on what Castor is doing, or where he is- because he and his Master simply do not know. They are called upon when needed and nothing else, it'd seem.
With that kind of personality, he seems like he'd be patient, and if you make it too sweet- he'll know he has to pass it up even if he would want to take it.
And- yeah- Masters won't cut it. At most I think they'd be a secondary priority...
Though with Mr. B dead, they might've bumped up their priorities a little if they've learned of it.
1.5 imperial gallons of tea were consumed during the writing of this post(after a little bit of a walk, they will see a boy with a tatoo on his arm)
(his fists are wrapped in flames, and he's punching his way through the forest, large explosions following every punch)
Are there any other options we have? Far as I know, we try to lure them out or wait for them to attack us. I don't think we should let them fight us on their terms. It has to be on ours.
-Miyu- I don't really like the idea of letting you die first. You're a lot younger than we are. You shouldn't have to sacrifice yourself for this.
We should die before you do, if it has to come to that.

-he turns to it-
dead devotion...Shit.
-takes a deep breath, then slowly walks over there-