Thanks the compliment!
So it sounds like you were at the Garrison, the Location power reads: AT THIS LOCATION: If you encounter a monster other than a villain or a henchman, each other character at this location must summon and encounter that monster. That being said, if you were at the Garrison and you your characters failed to the defeat the summoned rats by 4, they should NOT have been shuffled into the deck because they were summons. Thanks for the report as well.