I have no idea how you could interpret the prompt:mango to "bully"
but I guess it is not important. The key is to start the 5 minutes freewrite. The prompt is only the source of writing inspiration

I am not sure whether the bully is a true story (above) when you were a kid. But I do share with you it is not fun to be bullied whether in school and in your neighborhood.
I guess most kids go thru similar childhood day. For me, I do have a fair share to be bullied in school as well as in my neighborhood. When I was a kid, I live in a small town. In most towns, there are kids and teens live around your neighborhood and when you try to play with them, the bigger boys tends to show off and started to take advantage of you. And they do it very often and to a certain extend, it become a bully.
And during my secondary school days when I live in a hostel, The seniors plan for a "ragging" time as a traditional welcome ceremony. It looks like all new students have to go thru this "bully" because some has a hard time from seniors during this ceremony

Anyway, those were the days when you have to learn and grow with it

Cheers