When Vinigo shot a huge amount of flame from his own mouth, Luke reacted in the only way that could save him and Meredith. He used <Vind > to its maximum to disperse the fire just as he had done when he fought Marie, on the occasion when he dispersed the demon's sound attack.
The moment Meredith gathered the courage to open her eyes, she saw the fire approaching them, but Luke's hand somehow prevented it. Then, she remembered the Gene Skill that Luke used to extinguish fires sometimes, but at this particular moment, it was hundreds of times stronger than she was used to.
She looked at Luke and saw calmness in his eyes, not like usual, but a deeper look, as if he already knew he could contain Vinigo's attack.
During those seconds that Meredith stared at the half-wolf so closely, she finally noticed how powerful he was.