On the later nights, it is not the most beneficial to check the vents, as that time could be spent on keeping Foxy and The Puppet at bay and that most of animatronic would exit the vent into the office anyways.
On the later nights, it is not the most beneficial to check the vents, as that time could be spent on keeping Foxy and The Puppet at bay and that most of animatronic would exit the vent into the office anyways.