The openings in Decumia's world didn't release her usually purple energy. They had directly unleashed powerful storms that didn't carry any connection to her, which was obviously surprising due to their source.
Decumia's world seemed to have energy that didn't belong to her existence, but that was theoretically impossible. Yet, her ability to create chaos could stretch into strange realms, and the Foolery had gotten a taste of them.
The Foolery didn't care about its injuries, but the last exchange forced it to study the situation. Decumia didn't only overcome its physical strength. She had also placed defenses in her very world, which required a more strategic approach.
Yet, the Foolery had never been the intelligent type. Its ability had remained simple even after absorbing Steven. Its idiocy could create unreasonable wonders, but Decumia seemed able to predict them.