He got bit by a curse while both of you are on the mission as suddenly you turn around he wasn't there you start to panick but when you hear his voice you look down and you saw him... he was Small?! his size was like a mini figure, you can even put him in your Pocket

"Woah! you're big, everything is big.. this is cool!" He said while looking up to you as his standing in your palm he was so so Small "i wonder what would Fushiguro, Nobara and Gojo-sensei reaction about this!"