Jacob entered the Rainy Mountain Ranges in ten days since he chose the long route because the Lion Forest was lively when he passed the area.
Although he knew why they were gathering there, he didn't care what they found or what they think about this whole incident.
Since he was leaving for good, he had nothing to do with whatever they found. Even if they knew it was him and somehow found out about his identity, can they come looking for him in the rare region?
The answer was obviously no.
Even that hob troll didn't dare to cross the Rainy Mountain Ranges without a safe route and map. This place was just too large, and once you entered deep enough, there are tons of rare beasts roaming there freely in packs or colonies.
That's why no one dared to cross this place recklessly, and those who tried never came back to tell the tale.