What is the skill level of Klein, the hero in Twilight?

Crane is the strongest parkour after Brecon, female boxer Jed and Racine. He is a GRE agent and has received military training from the Ministry of National Defense. Strong personal ability, good communication, adaptability and viability. Crane was integrated into the killing place only one day after he parachuted into Harlan, and in the later crisis days, he showed much stronger ability than the Ta trio. His sworn enemy Les praised him as king. Later, a mysterious new species-nocturnal hunter, a scary monster with high IQ, forced other nightmare and plague spreaders to return to their nests, as if claiming this land as their hunting ground. Strangely, it seems to be obsessed with cranes. It is unknown where it came from, but Crane did not flinch at all, and he will fight it to the death with agile skills.