http://hn.vernccvbvyi5qhfzyqengccj7lkove6bjot2xhh5kajhwvidqafczrad.onion/stories/35177167
Then, as you say, you might have your random encounter, so while the players are heading for the orc room, wolves attack (the goblins aren't guarding the wolf-forest-gates, the DM muses). The fight makes a lot of noise. The orcs look. The orc chieftain looks. The goblins use that distraction. The characters might notice that or not, etc.