1 Dwalin: Far be it fra' me tae say "I toold ye so"... Wait, nae 'tisn't. {translation: Far be it from me to say "I told you say"... Wait, no it isn't.}
1 Mordekai: We have to cross the mountains a second time?
2 Draak: We cross two times so far; this make third time.
2 Lambert: And Kyros has sealed the secret dwarven passage with tons of slag.
3 Alvissa: Wait. How do the villagers in Cragfoot know what's happened here in Footcrag?
4 Villager: Oh, we use the teleport gate connectin' the villages.

Well they never asked if there was an easier way to cross the mountains.

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2018-10-29 Rerun commentary: Teleportation is a great way to travel. But it depends either on superscience technology or, as is the case here, magic.

Teleportation is a powerful ability to include in fiction, because it opens up so many ways to shortcut plots. The trick is to restrict its usage - don't make it available to the protagonists at whim.

Heck, don't even tell them about it until you have to.