When Sonia and Diya stepped into the Flowing Gold River, they understood why Ash hesitated.
Although time indeed had not harmed them, this did not mean that time couldn't detain them.
Knowledge.
Every drop of the Flowing Gold River's water encapsulated the lifetime of a mortal. Merely witnessing the Flowing Gold River itself could swiftly enhance one's Time Faction experience, otherwise, Mages wouldn't endure the torture of aging to death by soaking in the Flowing Gold River in an attempt to gain entry into the Time Faction.
But this knowledge was nothing more than superfluous noise to Ash and the others, just as looking at a hundred simple math problems wouldn't increase one's mathematical realm. Being of the Golden Level in the Time Faction, they could no longer extract any more nourishment from it.
"Follow me," Ash said, and with that, he dove headfirst into the Flowing Gold River and started to swim downwards.
The resistance was immense!