[Slight spoilers] During the fight; It started as a group of eight, now narrowed down to a trusty group of two thanks to Amo’s obnoxious vital instrument. Tamsy and Zanka are now back to back, surrounded by the turned cleaners who are under her control. Corvus of course figured something like this may go down, so he sent a single back up, just in case. Of course the cleaners didn’t know that.