Partial Shapeshifting + Instant Reset
Due to his strategic use of multiple Abilities during the battle, Eren's injuries were mitigated, preventing him from suffering the same fate as any other Master Ranker facing House Lowin's white flames.
Eren allowed Ariella to retreat when he decided to extinguish the white flames. He opted not to let them hinder his battle with the half-blood, as she was merely a distraction from his primary mission.
Still baffled, Ariella regarded Eren with a mixture of caution and unease, bracing herself for another round of deadly combat. She had devised a strategy to outmaneuver Eren by having her subordinates attack him at a critical moment while he defended against her. Her intention was to catch him off guard and allow her subordinates to inflict mortal injuries on him. She had selected two of her subordinates for this task.
"Kekeke. Do you think I am an idiot, Ariella, my dear?"