This felt exactly like it did in the novel.
The exams were supposed to last three days. The first day was designed to let the students acclimate to the vampire-infested terrain.
While surveying the area early on, we noticed a fog. It wasn't particularly dense at first, but it was thick enough to block a significant amount of sunlight. This allowed stronger and more resilient vampires of the ordinary class to venture out and attack us. They were still weakened by the sun, though, which made it possible for us to fend them off and kill them.
But here's the thing.
