It was obvious that Michael's patience was worn out after several days of trying to break through Selena's defense. It wouldn't have been that bad if the Nest Leader had remained silent, but she provoked him tirelessly. It was almost like the Nest Leader initiated the 'training' session solely to provoke him.
"Is that all you got? I expected more from you when I watched you fight Ligno'vsh. Maybe I was mistaken about you," Selena mocked in a light tone. Her comment wasn't anything special, but combined with the other comments and her promise to never let him enter the Origin Expanse if he didn't break her defense, were enough to anger him ever so slightly.
[You're humiliating us…] The World Serpent declared at some point. Michael was about to respond to that when the Wolf Curse growled in agreement.
