After 3 harrowing days, Christensen found the answer to his questions.
After his first day spent in this ice field, he came to a conclusion, this was a high-level area of the beast plane that he was not supposed to come to at his level.
Beasts here were either Grade D beasts or higher or Grade E beasts that were freaks of nature just like the Armored Titan Rhinos.
After the narrow escape from the attack of the Armored Titan Rhinos, that same day, Christensen and his beast almost died to the ambush of a Saber-toothed Tiger when they decided to rest to recover from their exhaustion.
Leo was injured after the harrowing battle but the Saber-toothed Tiger was forced to retreat. Every other encounter like this almost led to their deaths.
They were never the hunters, they were always the hunted.