Yea, if they were not kids I would have a hard time calling that sparring. I hate a body shot like that at any age being called a point, Especially when they have gear on.
I have been knocked out WITH headgear on and ribs broken WITH a hogu on so I am a big, big proponent of wearing sparring gear. It was bad enough when I was wearing them. Makes things much, much more realistic.
I don't know if this was your case, but sometimes people tend to hit and kick harder than they should when they see that their sparring partner wears gear. The gear gives the feeling that now you can kick and punch as hard has you want your sparring partner will be ok.
It's sort of like seeing a person wearing a red man suit. When you see that, you don't think; hit and kick softer.
It just occurred to me, that if the student is getting feedback on their strikes by how their sparring partner reacts, then that may encourage them to hit harder when they see that uncomfortable look that we all get after someone has landed a decent shot. It doesn't have to be a death blow type power shot, but it only has to be solid enough where you can see that your partner doesn't like it. Land a good face shot even a soft one without gear and you'll see your opponent dislike it. Hit too hard and your opponent's face turns into the "don't hit me that hard response"
The headgear isn’t really designed to eliminate concussions. Frankly, any headgear, football helmets included, doesn’t do much to protect from them. If you read the disclaimer/warning labels on them, you’ll see what I mean. The best they can do is lessen the impact so the trauma isn’t as severe.
It’s like the motorcycle helmet laws. I hate to say it, but helmets on a motorcycle don’t do more than protect your head if you’re stopped at a stoplight and fall over. Or keep your head from getting lumped up if you get hit by a stone in the road. I’m not a motorcycle guy, so this isn’t some biased rant.
A motorcycle or football helmet is going to keep your skull from getting cracked or your scalp from getting cut. Studies show the rate of trauma has gone down a good amount, but let’s be serious - people are still getting knock out cold and dying from head trauma all the time while wearing appropriate helmets and wearing them correctly.
Concussions come from your brain slamming against your skull. That’s going to happen no matter what you’re wearing. A helmet may absorb some of the energy so it doesn’t slam as hard. The foam ones don’t absorb very much energy. IMO all they’re good for is not cracking your skull if your head hits the floor.
As far as how hard people tend to hit with and without gear on, I can only offer some personal insight...
My previous school started out as bare knuckle. About a year or two into it, we mandated by our organization to wear sparring gear - head, hands and feet. Chest protectors optional. My sensei had us wear it most days, but still held “bare knuckle Friday” for anyone who wanted to go. Those of us who came through before the gear mandate hit a lot harder with gear on. All I can say is my mentality was I can hit harder now that we’re padded up. Pretty stupid if you ask me.
I had 20 rounds of sparring using knockdown rules in my 1st dan test. We were wearing head, foot and hand gear. I honestly would’ve rathered going bare knuckle. I wouldn’t have been hit as hard.