It's really not that at all. Or at least mostly not.As can be seen, a "Good day, axe handle" situation is a complete failure to communicate due to too firm pre-conceptions on what's going to happen...![]()
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I admit I hadn't considered trying to talk past the guards, but more generally, it's hobgoblins (who are very good soldiers), guarding a locked gate in a chokepoint where they can't be snuck around or ambushed. The gate is designed strategically so that it is well defended. That's the whole point, to make sure that nobody can get past the guards without them knowing about it. And as I mentioned before, these are good soldiers who aren't going to give up and wander off or let a guy through just because he lies believably. They have their orders.
So on one hand, yes, it is designed so that stealth or diplomacy tactics won't work. So you could call it a railroad, I guess -- but it's not me, as the DM, glaring and saying, "NO! You can't do that!" for no reason other than that I didn't plan for other contingencies. The hobgoblins have good reason to build and maintain a defense there, and to make sure it's as secure as possible, and they're good at it.