"There were at least three places, things that look like doorways all over the city, that were iced over." Corwin doesn't know where those gates lead, he just knows they're portals of some sort, and he assumes they're that way in a mundane sense rather than a magical one-- though he's starting to revise that assumption, since he knows this was the way into the Goblin Market last week. "And now there's this one, and another one elsewhere in the city-- different than the ones from before."