The siblings weren't that weak.
It's clear that their bad situation had affected their daily lives, thus, trainings and attitudes. Sometimes, they would be too cautious or too impulsive! Of course, every experience in itself is valuable!
So after their nervous run, the sibling duo quickly submerged themselves in the battle intent! They were aware that they have to kill and do it so quickly that their bodies would be unwounded.
Without wounds, it's far better to keep up using their powerful quantity of resources!
Boom! Boom! Boom!
Their lives might've been too bad, but now, they had hope that was carefuly assisting them using the fire vermillion birds!
That's why, after first set of the enemies fell, Daria and Guri became once again the real residents of the molten world.
The brutal world that was forcing everyone to kill themsleves to melt into nutrient to purify their bloodlines.
