Once Death began attacking, she didn't stop. One attack after another, her sword slashes flew in each direction, killing the beasts that were there.
With each sword slash, Death used a bit of her Divine energy to empower her Sword Qi and Sword Aura, which was the main cause of Death's Divine Sea draining.
The beasts didn't react to her attacks at the start, but once they began dying one after another, the other beasts rushed to consume the free Sunhearts. When those died, the amount of free Sunhearts increased by a lot more.
That caused more to pile over. Soon, the mountain of beasts began fighting among themselves to get to those Sunhearts, the masses slowly growing taller and taller until they collapsed next to Death.
When they did, many started coming after Death.
At that point, Death had to start using her Sword Domain and Sword Heart just to keep up with the attacks.
