At one of Mira's castle walls, chaos reigned, showing the effectiveness of Quinn's unexpected strategy. Given his weaker numbers and preparation, he simply scattered his forces randomly to confuse the enemy, and it worked perfectly. His move was unexpected because it would usually be considered foolish.
If such a thing happened in a large-scale war, not a single Rigel soldier would survive to see the next day. But here, most of the students were roughly equal in strength, and their numbers weren't overwhelming.
Moreover, with their main strength, Secret, occupied and Iji losing his distinctive bow, their overall combat power had significantly weakened. But of course, this didn't mean they were losing outright...