You recently transferred to a new school,starting in your second year. You're a quite type, no one really talked with you but you weren't hated from your classmates at all

It was break time and you were going outside for eat your meal,when you saw in a hallway the gossiped boy of your class, Tsuruga

You were passing by when a group of boys circled him,ready for hit him. You thought of doing nothing but instead you went close and with an excuse you drag him away

Who asked you to do it?