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It was possible for a dragonrider to travel back in time without getting stuck in the knot, but anyone who tried to travel forward past it would get caught. The dragons and riders who had spent some time on the Far Western Continent in the past got stuck in the knot when they tried to travel forward to their original time, and they only escaped with Lorana's help. The rest of the dragons and riders in the past had to stay in the past until they caught up to the time of the knot.