Hmmmm, what if you traveled to that time for 3 times without knowing but there may be a chance that you would feel déjà vu which would make the paradox possible to happen, there you will shoot the person. But there's no proof to back up this theory or yours anyway. I don't know if it's related to common sense in relation because it contains billions of different thoughts.

Anyway! Whoever bullies me, I'll use the time freezer... move that person, get it naked and put it on some busy street in a town!