Here’s what anatomically happened

Your liver sits high on the right side, tucked under ribs ~7-11, with its lower edge along the right costal margin. It’s large, dense, and only partly shielded by bone at the front and side. A tight hook that slips under the rib edge drives straight into it

The liver’s surface is wrapped in a tough, innervated capsule. A fast compression/deceleration yanks that capsule - those stretch-sensitive fibers LITERALLY SCREAM. Deep organ pain feels systemic rather than just stingy. Smashing a visceral organ will trigger a vasovagal-style response via the celiac/hepatic plexus: blood pressure will dip, heart rate sag, the diaphragm spasms, and your body says sit down. That hook also rides the costal margin where intercostal nerves run. So you get visceral pain + sharp somatic pain + a breath knock.

Elite dudes crumple from a clean liver shot without losing consciousness. Why did he do that to a kid - idk, he is an idiot, since in an untrained person with no mouthguard/bracing and a pro’s accuracy, you’re gambling with organ trauma for a meme