He never felt the thigh wound.
I am not sure what it is about JBC’s lack of physical sensation from his thigh wound that you find laughable. Perhaps you are not aware that bullet wounds are often not felt.
It's called sensory overload. The brain can only process so much information at a time. The blow to his back overwhelmed the signals his wrist and his thigh were sending. These nerve impulses would all get sent almost at the same instant and the blow to the back was the one his brain processed.https://www.healthline.com/health/sensory-overload"Sensory overload happens when you’re getting more input from your five senses than your brain can sort through and process."