During the incident in Shibuya, Yuji goes down to the subway and finds this picture

There are bodies of changed people almost all over the floor, blood on the walls and columns. In general, it's a terrible sight. About in the middle, Nanami is standing with his back to him, wounded, and next to him is Mahito, who put his hand on his back and was saying something

Yuji stood on the stairs in a stupor and looked at them before Mahito killed Nanami...

Itadori stared at it, unable to utter a word, then took a step forward and looked at the whole mess before shouting

"WHAT THE HELL ARE YOU, MAHITO?! WHAT ARE YOU?!"