Despite it seeming like she did nothing to help, Lady Kaelyn really couldn't be blamed for her lack of reaction.
Arianna had manipulated the heat in the atmosphere around the group, using her Fire Mana to generate chains of flames at such a close range that it was practically instantaneous to them. It was because of her immense Mana perception and use of the Soothe Into The World state, where she gained a greater connection to the worldly forces and processed things at light speed, which allowed Arianna to perform such an amazing feat.
Lady Kaelyn already had her magical staff pointed forward, her expression grimmer than ever.
But she briefly paused in that moment, a deathly sensation washing over her. One that made her soul tremble began to howl straight out of Gladius.
She stared into his eyes, trembling as she realized the nightmare had only just begun.