Curiosity
If it was anyone else that wanted to do this, especially with Atticus's current rank, such actions would be impossible to take.
It was completely unlike the ethereal cloak art. Back then, Atticus simply had to mimic the natural mana signature in the environment, adjusting it with every change in mana density.
But now, Atticus would have to mimic the exact mana signature of another individual. Even if it was for a slight second, it was still an incredibly difficult task.
Copying another individual's mana signature was more challenging than mimicking the natural mana signature in the environment due to the unique and personalized nature of individual mana.
Natural mana in the environment was more homogeneous and predictable, making it easy to mimic.
On the other hand, each individual possessed a distinct and intricate mana signature that was a reflection of their unique magical essence.