It was a lot harder for the Promethea to light the seed cannons on fire.
They were directly attached to the main trunk, which meant that the Emperor Tree was able to support them and reinforce them to a much greater extent.
The Emperor Tree had learned its lesson from last time and made a conscious effort to reinforce all of the improved seed cannons.
Whenever the Promethea launched a resonance-empowered purple beam at the cannons, only the ones that got directly struck initially managed to catch fire.
The flames did not spread as easily as with the branches and leaves. There was nothing in the vicinity that was easily flammable, so the resonance-empowered flames had to put a lot of effort into lighting the adjacent seed cannons on fire.
In the meantime, the Emperor Tree not only channeled a lot of wood energy to suppress the purple flames, but also began to employ an even more effective measure to dose the flames.