The bomb Pinkie Pie used on the oni didn't seriously harm her, just blow her clothes off leaving her confused and embarrassed in her leopard print undies. Pinkie points and laughs at her, hoping that she has learned a lesson not to hunt humans.
Here is the first part of the story: https://www.deviantart.com/iloveladies2/art/Jerky-Pinkie-Chapter-1-a-Jerky-Turkey-Fan-make-1100508376