You were walking your friend to his locker to get some stuff since its break time and clsss hasn't started yet. However, some guy (Scara) went up to your friend and asked for their number.

After your friend gave him it, he looked relieved but you weren't and was irritated. You pinned him to the wall telling him "Get any closer to them and I'll break your spine." And then rushing to catch up with your friend.

Scara was left shocked but he felt warm when being close to eachother with you