Timothy Paradox

I was with a group of people walking on the sidewalk. Suddenly a kid, probably around 12, runs past us and steals something. I chased after him for a while, but he was fast and running in circles. A woman was helping me chase him down, so I instructed her to go the other way and block his escape. It kind of worked. I caught him, and... cut him into pieces. Literally. I returned what he had stolen (a pizza), and left him without legs, lying in the street (next to a small building). Slices of the child were in the pizza box. The others noticed this, and laughed. "Daaaaamn!"