..That and punching anyone will do damage to your hand. At the very least you'll have scrapes and bruises on your knuckles, if you're lucky. Even experienced fights sometimes will fuck up their hands.
Yeah, while in the middle of a fight, yeah sure I can see someone not really noticing the pain and even ten minutes later, the pain is barely noticeable. It's not until you have calmed down and then it hits you like a ton of bricks. The rest of that day you are lying down on the couch with a bag of frozen peas on your face.