While teasing the embarrassing Jayna, Angus moves using [Beast Walk] through the misty lust forest and searches for Crabfrog. Since [Beast Walk] is originally the combination of various animal movements, it shows its true power in the forest's uneven terrain.
Angus passes through the forest and dodges every sneak attack like an unstoppable train. He ignores the nearby sneaky beast/monster since there will be no end if he fights back against every one of them.
The constant blurry image of the surroundings and how fast they travel made Jayna wonder at Angus' speed and skill. She can reach this speed even quicker but not while a person is in her arm and through this uneven terrain.
Moreover, she didn't feel any discomfort while they were moving at this speed and continuously changed direction with a sharp turn. This shows Angus' [Beast Walk] is more than just a fast movement speed but a complex and sophisticated skill.