I'm going to rewind this to episode 11 of season 2 of Mob Psycho 100

Teruki is being beaten by Shimazaki and he is seriously injured. You are a spiritualist, as strong as Mob. Currently, you are going to your brother's place. Seeing him being beaten, you didn't say anything. You pinch Teruki's ear and go home

Shimazaki: What the-

Teruki: N-Nee-san! Why are you here?