The battle with the Heroic Soul Army really exhausted Ash and his group.
Not only Ash, who had been leading the battle from start to finish, but also Sonia and Diya, who spent most of their time cheerleading, were exhausted. They hid in the car enduring the ever-present risk of sudden death while also coping with the dizziness and impact of the speeding car, their minds never relaxing for a moment... Like a tightly wound spring, even after releasing potential energy, the aftermath lingered, and they hadn't recovered from the terrifying battle.
Even though Ash and the others had experienced dangerous battles before, those were merely 'dangerous', and the Mages had some room to maneuver. But this battle with the Heroic Soul Army allowed no errors; should their sports car explode, they wouldn't stand a chance against the Heroic Soul Army.
They were constantly on the brink of death.