But, if the party was a couple of miles east, then they would still be in the forest but not at that location. So, still quantum. Note, you admit it yourself - AREA. The encounter occurs because of a completely arbitrary roll on a completely arbitrary table and occurs at whatever location the PC's happen to be in, regardless of their actual location. So long as they are somewhere in that forest, they will have that encounter.
So. Quantum. Unless your encounter can only happen in a specific location, then it has to be quantum. There's no way for it not to be. A few hundred yards in any direction and that encounter never happens unless our random encounter somehow, through some unspecified manner, always appears exactly where the PCs are. I wonder what that unspecified manner could possibly be.![]()
If you're in the woods and encounter a bear does it matter if it's not the same bear you would have encountered a couple miles east? Does it matter that if it's a predator that they often travel dozens of miles in a day looking for prey? No one is saying you run into a specific troll named Chaz, you run into a troll because there are lots of trolls in that forest. On the other hand if you do happen to run into Chaz, let him know he still owes Grognar 50 GP and he should just be lucky I'm not adding on compounding interest.