Evan:
We can be attacked since we were in one place for a long time.
Your attentions are roused by the smaller of your two captives (gagged, to help keep him from doing magic) making noise.
"Nnnn! Nnnnn! Nn nn nnnn! NNN-NNN!" he vocalizes, looking behind you in terror.
One of you turns (just one of you, in case this is the old "there's a monster behind you" trick).
It turns out there actually is a monster behind you-- a zombie.
It certainly hasn't been called here by your captive-- he's clearly terrified that it'll kill you and then eat him while he's still tied up...
(Roll 2d6 (since you're Consoled, Evan) to Get Violent.
(This is not another miniboss, by the way. I'll announce them.))