Igor witnessed Kadi's entire rampage. Moreover, this rampage was intricately connected to him. Originally, Kadi was not part of Igor's plan; Kadi had charged forward of his own volition.
At the start, Igor had wanted to use a Spirit Painting of the World Setting Technique to briefly confuse the enemy, providing everyone some time, but the effectiveness of the Spirit Painting had clearly failed. What was more ironic was that this Spirit Painting was intended to confuse the Undead Creatures. Instead, Kadi was deceived by these Spirit Energy Paintings, mistaking them for the real Igor.
In reality, Igor had concealed himself after being blown away by Wizard Reed's attack—a technique he had learned from Wizard Reed earlier. The reason Igor had to hide was because he needed to use spells that could not be disturbed; if interrupted, they would achieve nothing.
