Roaring-level is to comprehend true feelings.
When an emotion elevates to its extreme and becomes unbearable, an Earth-Level Martial Artist can transcend this emotion to break through and become a Roaring strong.
Roaring is the howl of true feelings.
Hence, many who successfully comprehend the Roaring later turn into peculiar people.
Because they trust too deeply in their emotions, they become ensnared by them, causing a change in their personality.
And Roar, is when this emotion is comprehended even more deeply, and another layer of change is made.
Often, such people almost look as though they have seen through the Red Dust, or something quite close to it. Of course, there is another kind.
And this other kind, is another extreme.
This extreme emotion brings with it extreme power.
This is also why this level can be referred to as a threshold.
The Earth Level, above and below Roaring, are completely different.