In a fashion.
On a lighter note, speaking of children, let's look at playfighting, something animal cubs do when they're younger to hone their fighting skills.
In the first video, you see two kids with boxing equipment on. It doesn't take an expert to see they don't really know what they're doing. But if you watch, you'll see that they do have a fighting/killing instinct that is exhibited in their actions. They are focusing their attacks mainly on the head (arguably the most vulnerable part of the body) and they are also doing their best to avoid attacks, mainly by trying to move out of harms reach.
YouTube - Racist Fight
In the second video, you see two kids playfighting on a bus. Here you see play biting as well as grabbing of the oponent's limbs to prevent them from attacking succesfully.
YouTube - fight
These kids do not know what they're doing by training. Their behavior and actions in said play fights are guided solely by instinct.
You'd be amazed what one can accomplish with their hands alone.