Out of concern and worry for her brother's health, Belle decided to stick around and aid him after they cleared off the horde of monsters.
Seriously, why is it always Brandon who's always at risk of dying?
Belle was tired of it. She didn't want to see her brother suffer anymore. Yet for some reason, it's as if suffering seemed to follow Brandon wherever he went.
Or more like, Brandon himself reveled in the suffering.
Belle couldn't do a single thing about it. She had reprimanded him numerous times in the past. Yet it always ended up the same way.
'Please, stop hurting yourself.'
But she kept it in her thoughts. There was no use scolding her brother for it now. Especially knowing what was happening to him now.
Belle had noticed it too.
The fluctuating influx of his mana core.
The signs of an S ranker.
It was absurd.
To think her brother had caught up to her, even surpassing her soon after.