Aarvi had learned about every reaction and expression of humans while studying acting so she was very quick to notice the difference in Leon whose chin was low, pushing it back, forehead ahead, eyes tangent to his upper lid and unwaveringly glared at her reflection.
As far as Aarvi knew, when Leon loses his control over his thinking, he becomes an untamed wild creature, which knows nothing but destroying everything in its vision.
Just like she had seen in the video of Leon throwing and smashing the things in the President's Office of Hays International. She hadn't missed noticing Dylan, he had looked all cool while watching Leon silently as though he was just waiting for Leon to get ready and everything was normal.
Aarvi had discussed Leon's behavior with Aaron and the latter had deduced that Leon might not only have a problem with anger management, that problem might also be affecting his behavior in extreme cases.