Again?

And how did they prepare themselves, by holding their weapons tightly and glancing around...acting very cautious at that moment. Not long after they had become cautious, they started hearing zombies' sounds, and this was confirmation that what Hugo said was true.

Once again, Hugo's statement was coming to pass, he wasn't wrong. And that made Ryder begin wondering once again, how does Hugo know these things? They'll just be exactly how he said them. They've asked him numerous times how he does know these things, and he has never given them a valid answer.

He's always like, 'I am always very cautious, that's why I do know these things', Or things like, 'I can sense them easily'. But Ryder felt like there was something else, but that something else he doesn't know, what could that thing be?

Ryder had no idea that a system was helping him know these things, and Hugo would never reveal to them that it was a system revealing these things to him...lots of things would spoil if he does.