Amazing how those particular once-in-a-lifetime ten seconds managed to be caught on tape. What a frickin coincidence. I bet she never hit her kid like that before, it was just a freak incident.
It may not have been that much of a coincidence. From what I understand, Ms. Toogood had become angry while in the store, and security may have been following her to see what she may have done (e.g. gotten a gun from her car).