After Ash and Filly were transformed into Starlight Bodies, they immediately knew they had been tricked by the Magic Master of Dazzling Star. Their Technique Spirit Transformation was interrupted, and Filly had to hold the Holy Grail with both hands, which meant Ash had to fend off all the invading mages alone.
And he couldn't call for help; he couldn't speak, and others couldn't recognize his original appearance. Even if Igula saw him in this starlight form, she would decisively smash his head!
But Ash understood very well that this was their best chance to condense the Holy Grail. After all, the first Holy Grail site was bound to attract the most mages, and those few who didn't enter the site likely had the self-awareness to just be bystanders interested in witnessing the event.
As the second Holy Grail site, there weren't many mages who noticed them, most of whom were merely uninvolved bystanders. It was the perfect blend of time, place, and people!
