Will you be all right... just the two of you?Yes, flags are something of a curse in this city.We'll be fine. No problems!Just figures that S-Rank human's involved, though...Now, the zombies have already been dealt with, but according to the information from [[DEVICE]], there are still some major powers active out there...
From here and later chapters, DEVICE seems to the name of some sort of intelligence organization or technology. It should be treated as a proper noun. I think it should be in all caps like the organizations GROUP, ITEM etc in Toaru Majutsu no Index. This helps distinguish it as a proper noun.
打ち止め "dealt with" is a clear shoutout to Last Order.The rumored S-Rank human, a vampire, the witch/demon apparently behind the magic thefts, and more besides...