For the allied forces, especially the galaxy-level beings, the event of the attack on the Orion Arm Star Field was shocking from start to finish, much more than joyful.
From the beginning, when they learned that Jia Yan, the Evolutionary Creature, was a super "tonic" capable of allowing their galaxy-level beings to progress, they were overjoyed. They were incredibly happy to be the first to find this information, feeling that the opportunity for advancement was right in front of them.
Unfortunately, great joy is often followed by great sorrow. This is like a person who cannot be overly jubilant, because while you have happy times, there will certainly be times of sadness. Being too joyful might make one unable to withstand the ensuing sorrow, leading to psychological issues.
