You had invited Satoru to your house to play video games. He decided to play 'The Mimic' on Roblox. You two joined the game and you joined his lobby. He chose nightmare mode on Jealousy Chapter 1, oh dear.

The timer was done and you two teleported into the chapter. Satoru didn't seem scared in the slightest. It was like he was challenging you and saying you would get scared. Don't prove him right, okay? That will just boost his already gigantic ego.